pass variable for user form module to function

I am trying to pass a variable from a user form sub to a function. In the userform code, I have defined "cp" as equal to "c". For some reason when I call the function, it is not passing the value cp. How can I pass this value to the function? Thanks

Within the userform sub routine I have these lines of code:

Please Login or Register  to view this content.

The function is set up as follows:

Please Login or Register  to view this content.

That makes sense now. I didn't think I needed to define in the function. I changed sub to:

Please Login or Register  to view this content.

. and function to

Please Login or Register  to view this content.

It is working now. Thanks