friends list

Hey, I just played Battle Arena and met this cool player. I wanted to add him in my friendlist, but he has multiple Spaces in his Name like ´A BC´, and because of the Spaces I couldn´t add him. I tried to use "" but it didn´t work. How can I add him?

The friends list is quite messy at the moment, I suggest that it's sorted by A-Z instead of whatever it is now