can someone help i cant change my user like whenever i try to, it resets to this one i currently have..

i neeed more chapters. (And someone help i cant change my user)

guys can someone help i cant change my username I've been trying to change it for the past few hours but it doesn't work. I've tried using many usernames such as "Kagehira Mika", "Shus long lost toenail", "Fyodors Infected Ingrown Crusty Musty Dirty Dusty Rusty Medical attention-needed Mushroom fungi growing on it Chipped broken scratchy toenail fungus thats skins been peeling off", "FyodorsFeetFungus", "Fyodors used tampon", "Fyodors used condom" and more so. Can someone please tell me why it cannot change the user to that? Im desperate to change it.