I just found how to properly respond to a post, i.e. select part of the post and click on the appearing “Quote” command (note: this is a very hidden feature; it would be much more convenient if there was a way to make it explicit).
Now I would like to rearrange a couple of old posts where I messed up the thread. I can understand that a proper rearrangement feature could be too specific for a forum but I did not find a “Delete post” either.
Does it exist?