The manual is here -> http://www.teamtekin.com/Manuals/TSC...11G2,420G2.pdf
And it's not one of those fancy 'one-touch' jobs either. You need to fully read and understand the manual to set it up. Your current problem is related to adjusting the 'neutral point' It's a great old school ESC and would still be competitive today. It's just not very 'convienent' in regards to setting it up.
Turn on your radio and vehicle with the rear wheels in the air. Center the throttle trim on the radio. Adjust the 'neutral point' adjustment in either direction slowly until the motor just starts to move forward, then crack the adjustment back a hair until it stops. Neutral point is now set and you will use reverse on the throttle to apply the brake. There is no drag brake. Forward should go forward, neutral should do nothing and reverse should apply the brake. Once you have the ESC setup int he area you need it in, you can just use the radio's trim adjustment to fine tune it from time to time.
Current Models/Projects: Kyosho Optima Mid, Kyosho Shadow, RC10T4, RC10 truck conversion, Tamiya Clodbuster, Bolink Eliminator Sport