[Closed] How do you delete a custom attribute

I’m sure this is a stupid question, but I can’t seem to find the answer for this anywhere, or if I have, I didn’t understand the language to realize it.

I added some custom attributes to a hand control to drive the finger rotations, and I accidentally added 5 fingers sliders, plus a thumb slider, so one finger too many. I added them through the Parameter Editor, but I can’t figure out what menu might edit or delete them.

So, where do I go and what is it called?