Slow down the clutch…. add just a bit of throttle– but just enough to keep it going.
Practice driving as SLOW as you can in a straight line, using the clutch and throttle- then add in turning once you got the hang of it. If you still have problems turning, you might want to practice balancing on a bicycle by going as slow as you can and counterbalancing to turn. Counter balancing on a bike is very similar to a motorcycle (except for the whole weight thing).
oh… I might be wrong but… DON’T control your speed with the rear brake while turning… I’m pretty sure that’s a good way to drop the bike…
Use your throttle to control speed— but use very GRADUAL twists of the throttle. Sudden throttle changes, or braking causes instability while turning, increasing your chances of laying down the bike.