Oh Nevermind I think I don't need a master password at all I thought I would need it to transfer money or to change my char name but its a different password. Its a tagpassword and a cashcode. Looks like the masterpassword is not used anywhere. Don't know why it's mentioned in /rename.
/set cashcode <cashcode>
Set the account code to allow remote access to this character's account; if the code is 'none' then remote access is disabled. The code can be any string of letters, numbers or symbols.
and I got confused by:
/renameme <new name> <tag rename password>
Changes the name of the character. Costs 2 million credits. You will be kicked immediately after executing this command. When you log back in, the change will have taken place. This command can only be used once every seven days for any one character. There is a 5 minute grace period after you execute the command where you can use it again, which can be used in the event you misspelled the new character name. This grace usage will cost another 2 million credits. If the tag is protected with a rename password using /settagpass, it should be entered in <tag rename password> - this is not the master password for the tag.
Looks like they don't mention the masterpassword else where, but I wont need it anyways I just wanted to rename my Char and maybe send Money to another Char but with those 2 commands that should do the trick.