Eladamri:
Ray's correct here. "Eladamri, Lotl" is your player name. Your nickname of "Eladamri, Lord of the Leaves" is just used a tag and has no bearing on your submissions. When the game prompts you for an alias, just use "Eladamri, Lotl" and it'll work. Be sure to include the space and comma. Nobody seems to know if these screens are case-sensitive; it's best to play it safe.
My original nickname was "Lone Locust of the Apocalypse" - also far too long for a player name - but my games submitted just fine as long as I used my "player name" of Lone Locust when submitting.
Good luck, and good gaming!