I read somewhere that if you just stop using it, it'll auto-expire/delete but don't remember how long it was. But that means stop using all webOS devices that are on that account.
Ridius
Please do not send me direct messages unless I ask you to. Random Direct Messages asking for support will be ignored. Please post your question/help request in an existing forum thread or create a new one so that everyone can benefit.
If you like IRC, feel free to drop by #webOShelp on Freenode. I hang out in there quite a bit.