There will be an Allen key on the wheel side of the disc (I think it's 3mm) turn it clockwise a bit, spin the wheel, repeat until it rubs the rotor, then back it off a touch until it doesn't.
The Allen bolt that controls the position of the outboard pad (opposite side of the brake to the one you've just adjusted and 2.5 mm) turns much more freely than I'd like on mine. It might be worth checking that one as well.
There will be an Allen key on the wheel side of the disc (I think it's 3mm) turn it clockwise a bit, spin the wheel, repeat until it rubs the rotor, then back it off a touch until it doesn't.