Won't let me type in minecraft pe chat, or name myself

so, it all started when I tried to make my name a colored name. i succeeded, but I wanted to change it to a regular name, but when i deleted everything, it didn't let me type anything. And I can't chat so that sucks to, but I won't need it cause if I have no name I can't join my friends worlds! please fix this bug mojang I really love your game and would love it if you could fix it, thanks!