EDIT: This is wrong, see OP's comment with the right answer
Not an expert, those who know more please correct me.
I will explain what I understand with an example; let's say I want to report your comment (the one I'm replying to).
Because I'm reading it from https://lemm.ee/post/3809349 , if I report it here, I would be reporting it to lemm.ee admins. Now I need to decide if I want to report it to:
- ~~lemmy.ml admins: the instance of the community in which we are commenting~~
or
tkohhh.social: the instance of your user
Then, because there is no way to "translate" a post / comment link from one instance to another, I need to go to !lemmy_support@lemmy.ml through the instance I want to report it. Let's say tkohhh.social
So I go to: https://tkohhh.social/c/lemmy_support@lemmy.ml and log in
Then I look for the post: https://tkohhh.social/post/10726
And if I report it there, the report should be sent to tkohhh.social's admins.
Note that (if this is correct) it requires an account on the instance you want to report to... which is why I did an unofficial report when I found a spammer on another instance, using the Meta community of that instance: