Gotcha.

Try taking a look at the items/objects already set up (like chairs) that have unlimited uses + do something. Check out how they're doing it in sidebar (after clicking said item/object) under the "Item State" section > "Use Actions". Should be easy enough to set up an action that gets triggered by click (or "using") your item/object.

Sadly, the documentation is lacking in this regard. If you can't figure it out, maybe check back on the wiki in a little while.

Cheers!