Love it!but I can’t do one thing – Good Fonts: Text Font Keyboard Review

I got this from a app call TikTok I wanted to change my username so I found some fonts that I really liked and I couldn’t choose I chose one and wrote my username I copied it but is didn’t work I kept clicking it turned off my iPad and waited restarted it but didn’t work but love this app? :}
Review by hfnkif on Good Fonts: Text Font Keyboard.