Main Page
Welcome to Bulbapedia! To get started, register here. Enter your desired username and password, and click on the 'Create new account' button. (At present, this is not possible. Contact a sysop to create an account for you; to create an account if you're a sysop, enter the user's desired username and email address, and click on the 'by email' button) After you register, first visit the Manual of style page for information on the rules of Bulbapedia. Another place you might want to visit upon registering is the instructions on how to create an article. After that, you can start contributing!
If you're unsure of a good place to start, simply click the "random page" link on the left toolbar; if you see a red link on a page, it means that there is no content on that page. You can make it blue by adding content to that page. A more direct method is to consult the List of wanted articles. Instructions on using the MediaWiki interface can be found here.
A list of all pages which currently have content on them can be found at Special:Allpages, and a list of categories can be found at Special:Categories.
Administrative Information
To grant sysop or bureaucrat privileges, go to Special:Makesysop. This is available to bureaucrats only.