Looking at the disc caliper, can you see the gap between the pad and disc?
can you read the owners manual [online, if not in print?]
not knowing the brake brand/model used means you do the research to find out.
I'm not familiar with disc brakes on bikes.
the Dealer that you bought the bike from should be able to help , did you use the telephone first ?
Ot just go to strangers , here. ?