I believe the login info is stored in the config file. If you open xterm and do a "cd .sipie" (it's one of those hidden directories; /home/user/.sipie if you become root in xterm), you will find the config file, cookies.txt, and possibly playlist. Try deleting the config file and I believe you will be prompted for the login info. It may be that the login info is also stored in the cookies.txt file, I can't recall.