1°) I repeat, but use a username with a password this way: Username@Password.
2°) Add a custom image in .png format to the ./uploads/avatars
folder, taking care to rename it if there is a space in the user name and replacing the @ with a _.
Example: My pseudo@a52d7Z97
Become: Mypseudo_a52d7Z97
3°) For administrator or moderators, do not forget to log in first before publishing a discussion or response.
4°) Optional: Add the signature plugin for even more customization his "account".