Usually there are 2 adjustment points. One at the clutch lever, and one on the clutch pull on the crankcase. Follow the cable from the handlebars to the engine, there should be an adjust bolt or two. The adjustment at the handlebar lever is usually a screw with a thumbwheel lock nut. Depending on what you are trying to adjust, dictates which one you will use and in what direction it will go. If the clutch is slipping, use the thumbwheel adjuster. Loosen it, back the screw out 2-3 turns, tighten. and check you clutch. if this one is all the way out, go to the crankcase, loosen the bolt on the richt side of the bracket first, then loosen the left one, one turn at a time, checing the clutch. once it's where you want it. tighten the right bolt only. You can do this with a set of open end or box wrenches. An adjustable wrench works in a pinch.