It must mean the disc is rubbing on the pad.
Is it a constant sound or an intermittent sound? If it's constant -
First, open and close the quick release with the bike the right way up, you didn't say if you did it the right way up or not.
Not fixed?
Second, providing it has a post mount, undo the bolts attaching it to the adaptor, and reposition the caliper so it's not rubbing on the disc. You can tell by looking.
If it's a hope, you may need to take it off and pop some washers under the bolts on one side to achieve the same thing.
That should fix it if it's constant, but if it's not, get back to us.
If it's not constant -
Spin the wheel, find where the disc rubs on the pads, notice which side the disc is bent to, then apply pressure to the disc to the opposite side, until it's straight. Try not to overdo it, but you can always push it back if you do it too much.
Make sure there's no oil on your fingers when you do this, lol.