This is basic adjustment 101. I'm not positive, but almost, that you have an adjuster on the clutch lever. There should be a threaded inner piece (adjuster)and a larger diameter ring (lock). From the saddle turn the top of the locking ring toward you to unlock the adjuster. Then turn the top of the adjuster toward you to tighten the cable. When you have it adjusted right, turn the locking ring to keep it set in that position untill the next time you have to adjust it. Also read your manual or get a Clymer book from the library. There are a hundred things like this that you should be able to do in your sleep. Do not bend your lever.
There is a slim chance that you are out of adjustment at the clutch lever. In this case, you can do similar adjustment down where the clutch is actuated on the engine. Don't be afraid of this stuff. get to know your wrenches. They are your friends and your KDX will love you for it.
Mark