Google and YouTube fella.
The caliper bolts are what holds it onto the frame/fork.
The pistons are inside. Use a massive flat head screwdriver.
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Haven’t you had this bike for about 3 weeks? Did you get it from a bricks and mortar and if so I’d be taking it back and getting my free check up/ asking them why it’s happening…?
Yeah I will do that.
I have repeats on box hill in an hour planned, although it’s too hot and I was sick and asleep all yesterday. If a quick tweak sorts it, I’ll do it. Otherwise if it’s a bike stand kind of job, then I’ll leave it rubbing until Monday.
Also, right brake lever has much less play than before. Not sure if that’s a symptom or cause.
Mine was rubbing few weeks back.
I went to undo what I thought was caliper bolts… Next thing I’ve got brake fluid all over the floor 
Some of us shouldn’t be allowed to own tools.
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Something must be happening in transit - I can’t even get the wheel in now.
All I’m doing is removing the wheel so the bike goes in the car and putting it back on.
Edit
Seems to be okay after levering the pads open with a screwdriver 
Apologies if I am stating the obvious but with your wheel out and putting the bike in your boot if you have caught/pressed the brake lever you will have pushed the pistons/pads closer together so it will be very tight/impossible to get your wheel back in i.e. the rotor won’t fit in the gap between the pads. I think the only solution is to push the pads apart as Poet says with a wide screw driver (using the flat part rather than the edge) but very careful to avoid damaging the pads or take the pads out and push the pistons apart (without scratching the piston surface)
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Yeah your bike is leaning on the levers there
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There are plastic spacers that can/should be used when transporting your bike like that, in case of any accidental braking without the rotor there.
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You’re using the plastic spacer for that, right?
The lever is pressed, so you’ve set the pistons further in.
Also, WTF are in your bars???
Bikes exist so we don’t have to use cars 
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Looks like wine bottle corks to me. How much wine can fit in the bars?
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Ahah. I feel like this is something the shop could’ve told me.
Is it something you have to buy, or is there something wine-related I can use to slot in between the pads?
Nothing obvious to someone who has never had disk brakes, never had electronic shifting, never had tubeless, and never had through axle.
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Did you not research disc brakes and maintenance before purchasing?
Carry out a full risk assessment?
I did when I bought my BMC six years … and opted for rim brakes. As it suited my use case (flat, fast, dry, with the occasional dry hill if there’s a porcine based snack on offer at the end)
Disc for gravel.
Rim for TT.
Legs for fixie.
I’d like disc on my winter bike, but not a must.
As I’m not a mad fan of hills when it’s moist.
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It’s something like this https://amzn.eu/d/0fwL7nj5
The little clip at the end holds on to the pin for the pads…
You could probably MacGyver something up, maybe with an expired plastic membership card folded in half and some elastic bands to hold it in place?
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Have you ever wondered why bike bars are the diameter that they are…?
You’ve done this to me before … the quote from which you took this single word was carefully worded to avoid being patronising.
I wasn’t doing anything to you, I assure you. It’s perfectly fine to point things out, especially when I am a newb to these techs. I’m sorry you don’t like the way I quote things, I do it to emphasise my point, not yours.
In other news, I have discovered that the little handle on the through axle comes off! 
I have been annoyed at the angle it points at since I got the bike - never thought it might detach. Lucky I haven’t lost it on a ride really…
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Then why bother with the quote?
The £400 Frankenbike lives on 
55/42 upfront
23-11 at the back.
Chains a bit short, so must remember to drop into the 42 for any “hills” - ha ha ha 
Goldie looking chain.
FTW 
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Right I need to replace my rear derailleur cable on the P3 - am I going to get any issues internal routing wise from sliding the old cable out? Will the new one just slide straight back in and pop out of the rear chain stay? Just thinking that there may be a guide or two within the frame?