Click on the bit that says Teddy (or whatever name ur log in mother issued you) It is next to the word inbox. It’s in the top right of this page.
Then personal details and it’s called custom title.
Think it’s slightly different on a desktop.
If u still can’t change it, perhaps the internet isn’t for you.
Suggested alternatives:
Daisy chain assembly classes
Kevin Spacey fan club president
Mail order fishing
Ladybird entertainer
Obese leotard designer
Mouchtashe enthusiast
Swine merchant
Elizabeth “Richard” Taylor impersonator