sure sounds like the little tag, which is a wear indicator, whose job is to squeel when it's time to check the brakes. Are you sure you bent it back enough?
Changing the pads is easy. You can do a search in the brake topic on this site and find a ton of advice.
The rotors come off all as a single unit with the hub snd lug nuts. Behind the center cap, which you carefully pry off, is the main wheel nut. Better be learning about that, if you replace it wrong you can wipe out your bearings, or much worse. It is a critical fastener and adjuster. You don't just tighten it up.
Do a search on this subject, easy to do here on the site.
All-in-all, the whole deal is a piece of cake to do, but you have to have studied it a little first if it's your first time.
Two Lane Blacktop style street and strip car:
Blueprinted 454, sequential port injection, forged everything, roller, Digi-6, SFI'd McLeod,TKO-600, cryo'd 1350s, Dana 60 w/ Detroit Truetrac, 12" 4WDB, adjustable coil-overs w/ Global West front, full adjustable rear, NHRA cage, Street Lights, 12:1 steerbox, baseball bats front and rear, solid body mounts, fiberglass hood and tailgate.