How do I set parameter for function?

It's an old Function object on your screenshot. You need to use the new Functions (with black icon).

construct.net/en/make-games/manuals/construct-3/project-primitives/events/functions

i tried but cant, can u help me for write this code.

i trying to connect dots (tutorial from YouTube)

(youtube tutorial)

(My code)

Instead of Function.Param(0) and Function.Param(1) use the named parameters you defined - TouchX and TouchY. They can be used like normal variables inside the function.