Tektro IO Mechanical Disc Adjustment Problem

I'm readjusting the Tektro IO mechanical disc brake's on my bro's new Avalanche 3.0, the front i have sorted fine but the rear i'm having trouble with, the movable caliper pad is rubbing against the disc and i can not seem to move it away from the disc, i completely disconnected the cable from the disc so that the arm the cable connects to is fully open but the pad has not come back and is still touching the rotor.
I've have checked the manual and it doesn't seem to mention hove to set the pad back further.
I've have checked the manual and it doesn't seem to mention hove to set the pad back further.
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You can download the manual from here which has instructions on how to adjust the brakes.
Rick
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