How do I get a ReturnValue from a function

I tried all the permutations i could think of. How do I get a value back from a function that uses set return value?

Here is picture of the error I get in my call to the "getit" function which returns a single number via set return value.

Thanks for your time.

Edit:

Function.Call("getit", XSquare.UID)

Great, thanks balckhornet.