Look I think you should learn lower revisions like 317+525 before going onto 562 if you cant fix this.
Heres what you need to do:
1. Go to data/scripts in Runeslay source folder
2. Look for authentication.py I recommend using notepad++ to edit or IDE anyways rep for the help if it works witch I know it does
If there is anything else you need help on changing/fixing/coding add me on skype my name is juggalo-pride or pm me on here after I get back tomorrow after school good night.
to change the rest of it go to
either testworld.java or w.e its called or clienthandler/rslogin