Why don't you ask with your main account? What's so hard about it?
on the other hand I found no writing "report to moderator"
It's in the bottom right corner of every post you make, but I don't know if you're restricted to that. But I can see it clearly.
Image just to serve as an example.
I still don't know how to remove it.is there any other way?
There is no way to delete or edit post on thread that have been moved to the archive board. You can report the post to a moderator for deletion, but I can't guarantee the mod will delete it for you.