How to fix the valves on 2.4 ingine - 1995 Mitsubishi Mighty Max

If you are referring to the engine valves that are in the cylinder head of a 4 cylinder engine, you will be needing to get a repair manual, as it will take many pages of instruction to do this job.
Perhaps 20-30 pages, or more.
I should recommend you go to car parts store or a library, where you can buy or check out a repair manual.
Some publishers of these books are, for example : "Motor's", "Helm", "Haines", and "Chilton's".