how to pass values to afunction?

Answer 1

What language? They all vary, but the general form is

function_name(value,value,...)

but as I said, this differs depending on language.

Answer 2

When you have a function like this
Private Function MyMessages(Byval strMsg as String) as String
If strMsg = "Hello" then
MyMessages = "Also Hello"
Else
MyMessages = "What you like"
End if
End Function

In this way a string was passed to the function and the function returns a String after it evalueted the String

Helmut