1 Thing Plugin - Index Finder - Get the index number for any item in your list

Could you actually please describe this another way? I’m unsure about how to use it.

I type in “Find” and I don’t even get any results in a Workflow Action. Does it need to be on a specific workflow?

I really just need to find the index of an item in a list when I’m in an existing action. Is this what this does?