I can't find my friends username anywhere. I tried searching their character's names and looking for them (They're not found). I looked up their categories and their username. However I can't seem to find them no matter what I look up!
I know it's a boring answer, but you could probably ask them for a link to their profile in the meantime.
try typing in your browser search barhttp://charahub.com/user/jadegreenor in your casehttp://charahub.com/user/Rougethecatetc etc after the last slash the name of the user you want to see.