1: that is what I meant, thanks!
2: I tried to access the group section as guest, you can't, so, why there's a distinction if both do the same in the end?
3: ok, so, I can request that another user receives invite, but let's say I want to submit a request for myself, can this works for my own usename too?
In other words, can I request my own membership?
4: If you're the creator (or have got permission from him), you can set the group permissions. There's a box for warn a post and even tough I should have the permission (I even see the word "warn" on other's post), it says that I do not have the permission to perform this action. I also learned that if edits on a posts exists, you can use the history function if you're mod, but even tough I have that options on other's post, it does the same error.
So, why this options exists if I can't use it?
EDIT: btw, tags don't do alert on edits