If your 1995 S10's clutch is not engaging properly, the problem is likely one of these:
* Low Fluid: Check the master cylinder reservoir. If it's low, you have a leak somewhere in the system (master cylinder, slave cylinder, lines, or hose). This needs to be addressed immediately. Simply adding fluid is a temporary fix, you need to find and repair the leak.
* Air in the System: Air in the hydraulic lines will cause spongy or incomplete clutch engagement. This requires bleeding the clutch system. There are numerous guides online and in repair manuals showing how to do this.
* Worn Master Cylinder: A failing master cylinder may not build sufficient pressure, leading to poor clutch engagement. This requires replacement.
* Worn Slave Cylinder: A failing slave cylinder won't push the clutch fork properly. This also requires replacement.
* Worn Clutch Disc: The clutch itself may be worn, requiring replacement. This usually manifests as slipping or gradual engagement.
* Leaking Hydraulic Hose/Line: A leak in the hydraulic line will cause the same issues as a low fluid level.
In short, while you don't "adjust" the 1995 S10 hydraulic clutch, you can address the underlying causes of poor performance. Start by checking the fluid level and bleeding the system. If the problem persists, further investigation (likely involving a mechanic) is needed to identify the faulty component.