The first link, which should be your username, is to a blank page that you can customize however you want. Actually, any registered user can edit your user page, and you can edit theirs, since the user pages are just like other pages. But we view these pages as places that our users can use as their own personal home pages within the wiki.
This is a discussion page associated with your user page.
The preference page is a series of tabs for various settings that control how the wiki behaves for you. Mostly self-explanatory; See Help:Preferences for more info.
Shows changes to pages on your watchlist. See Help:Watchlist
Shows a list of all the pages you've ever edited in EcoliWiki
log out of EcoliWiki.