Am 19.03.2017 um 23:00 schrieb Ralph Arthur Bell:

Hello, I am a newbie and I would like to know why during the register phase I cannot set my own username but my full name and surname? It is not common situation for forums. :) Best regards.

The forum is basically an alternative view of the newsgroup based
message database. Since newsgroups use an e-mail compatible exchange
format, a (publicly visible) e-mail address plus a display name ("full
name" may not actually be the best term) is the natural choice. A
separate user name on the other hand couldn't be displayed in a
meaningful way over NTTP.