Just let us know - hit us up on the contact form:

1. Select "Developer Access."
2. Tell us who you are and what you make
3. Select somebody in your company who will be responsible for checking the forums on a regular basis, answering user questions, and the like.
4. Give us the username for that person.

http://precentral.net/contact

Note: we will exercise some judgment in creating these forums for developers. You should have some kind of 'going concern,' which is to say that you should have either a 'flagship' app of high stature or multiple webOS apps and also plan on supporting webOS for the foreseeable future.

You'll also need to be sure somebody from your development company checks these forums on a regular basis for questions and suchlike.