How do I add function?

hey C3. I agree it's a pretty simple (dumb) question but my old school brain has a pattern of Add Action > Functions > pick from list of functions.

Now I see three options I'm unfamiliar with and a brief search didn't provide much insight.

Does anyone have an article or explanation on what these three options mean and which one I should use if I just want the function to execute when the condition is met?

Thanks in advance and apologies on the question.

You can just right click in the event sheet click "Add function".

Then when you click "+ Add action" --> "Functions" it will show up in the list under the header "Functions".

Keep in mind that if the function has a return value it will NOT show up in that list. You can only access it through expressions (i.e. "Functions.Function1")

Oooooohhhh..... Wow. Thank you.

So I feel like I'm in a dif dimension here.

The function should calculate several numbers with the result setting a global value with a string.

I've done this for several years and don't remember struggling with this so much.

If I want the script to set the global value, how do I need to set it?