In case anyone else encountered this problem. You have to edit your function and check the "has return value" box. Then your return will work. After this you have to use "Call Function" again and now you have a new field for saving results.
Variable Increase question
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You mean we have a loop and for example:
var0 = "any"
and for each repition the 0 goes one number higher?
I dont think you can do that, I tried it once but it really doesnt seem to work, you will need to use lists I think,
ive been looking around this problem too and this was the only solution which came to my mind