If you accidentally add a space at the end of your character's name, click out of the name bar,
and re-click on it, the space will not show up. It's still there, and won't let you create your character, but you can't remove it. I've made the same mistake many times LOL, I usually just write down the markings and color codes of my character and recreate them. c:
Adding on to what have been said,
What I normally do is click 'Create' so I will have a default character to work with it. I then add the name first making sure there's no spaces so I won't have to worry about that glitch, save it to see if it goes through and then go back and edit c: