I can't find my username in simcity game?! Please... help

If you mean the game/city name you chose, you go under the tool symbol at the top and choose change my city name. You don't have to change anything, or simply tap on your circular level symbol at the top. I think your name is viewable as well as points needed until next level. If this is not the info you are looking for, then,,uhhh...I hope someone else can help you out, lol.contact support if you can't find the answer, they respond quickly.