iTunes not allowing me to restore without turning off find my iphone

I restored my iPhone back to a 2013 back up to try and recover old photos that I once lost but trying to go back it won't let me restore it without switching off find my iPhone and at the time in 2013 the username was different as I used a different email address to log into my iCloud account it won't let me select another username and won't let me sign out without entering a password but the password doesn't work as the account with that username doesn't exist.

Does anyone know how to get round this?