Clutch push rod adjustment is a routine maintenance item explained in the service manual.

Assure having some "slop" in the cable.

Removing the access plate should reveal the adjustment screw and locknut.

First, slightly loosen the locknut.

The hidden end of the screw interfaces with the push rod.

The basic idea is to lightly seat the screw against the push rod, then back the screw 1/4 turn away from the push rod, to thereby provide a small gap between end of screw and push rod.

Here's a possible snag ---
The screw is part of an actuator assembly.
On some designs (screw-type), the screw turns clockwise to seat before turning counter-clockwise to provide the gap.
On other designs (ball and ramp), the screw turns counter-clockwise to seat before turning clockwise to provide the gap.

If the attempted adjustment fails when turning the screw clockwise to seat before turning counter-clockwise to provide the gap, try again by turning the screw counter-clockwise to seat before turning clockwise to provide the gap.

Remember to snug the locknut before finishing. Just snug is plenty tight enough.

Lastly, reduce "slop" in the cable to produce desired amount of free play in the lever at the perch.

Good Fortune!