2000 Honda 350 S hard to switch gears

A friend of mine told me that since it’s hard for me to pull the gear shift up with my foot that it could need to be adjusted. Can anyone explain to me how to do this? I looked in the manual that I have for a 2000 Fourtracks, but the adjustment doesn’t seem to be the same. On mine, I have a screw that holds the selector into place on a little gear. I tried adjusting it this way, and it didn’t help.

I’ve taken into consideration my leg problems, but the guy said it shouldn’t need to be raised very high to switch gears.

Any help is greatly appreciated!