I’ve fielded a handful of questions via private message about your username, versus your Full Name, so I figured I’d answer it in a post instead.
You have two ‘names’ according to the system, a username, and a full name. Your username is, among other things, your login name. Your full name is, basically, anything you want it to be, but I suggest your actual name, or a known nickname. Your username is the name the site knows you as, how you log in, and how you can be @-mentioned (@rmccown-admin is me, for example) Your full name is shown next to your username in posts, and is also the name used in chat (more on that in a bit.) If your username and your full name are the same, only one of them will be shown.
Usernames must only include numbers, letters, dashes, dots, and underscores. No space, etc, so you cannot make your username your real name. This is because the system uses your username as a tag of sorts.
You can edit them in your preferences. (Top right menu under your avatar) The only caveat is that chat will not pick up the change until you log out of chat itself (the Log Out Of Chat button in the lower left of the chat window) and then refresh the page. The chat engine saves your name separately from the main LSC site.