Welcome to Imperion! This handy little guide will get you from interested guestfish to registered member! It's actually quite simple. There is one thing to note, and that is that Imperion is hosted in the main admin's basement. Sometimes the power goes out. ¯\_(ツ)_/¯
What you input for username will be used for displayed name if you leave it blank. Username is what is logged in with, and displayed name is what you're called on the forum. Gaia does not collect email addresses.
When you log in, if you wish to remain logged in, tick "remember me."
Once you're done with a character, and would like to go play with them, you can tick the ready to play checkbox, and save the character with it checked. The character should appear in your character post-as list in posting screens where character posts are enabled.
Enjoy, and welcome to Imperion!