How do I add/substract from number stored in array?

Hi, is it possible to do the following with array numbers?

on button press : subtract 5 from cell x,y

I thought you could manipulate array cells just like global variables, but there doesn't seem to be an event pointer for it/online manual.

Thanks.

If you know the cell can use these actions:

Well, it works for me. Something in your approach must be wrong. Here's a more complex example:

1drv.ms/u/s!Ap_-qxoGKbDcg3PuvzPy51vL0C96

Sorry!

It does work - I changed a few things in my event sheet and it's perfect now :)

Thanks.