If you have forgotten your username or password, you can request to have your username emailed to you and to reset your password. When you fill in your registered email address, you will be sent instructions on how to reset your password.
Would be nice if mobile had clue helper ijs. It's a nice touch to osrs mobile.
RSPS Mobile would take far to much custom coding to be able to implement such things, its generally something that will more than likely never come due to the amount of work.