Does anyone know how to do this. My pedal is weak, but my fluid is full. How do I make the pedal tighter?

 

The pedal adjustment only changes at which point of pedal travel the clutch engages. If the spring is getting softer, that is an indication of your pressure plate losing clamping pressure. That's only fixed by replacing it. If you do this, you should do the whole clutch, obviously, and if you like a strong feel, use an ACT clutch which has a much higher clamping force, and, as a result, a much higher pedal effort.

Good luck,
John