There are a few things you can add to your profile here that will help other people get to know and connect with you before meeting face-to-face. In the left sidebar, click the "My account" link to edit your profile.
Under the Edit tab you can change your user name, email, password and avatar. The "info" sub-tab lets you add your location and any extra info about yourself.
The My Follow Links lets you add your Twitter, Tumblr, Flickr, Last.fm, Facebook, etc. links.
We're currently having an issue where some people are asked to confirm their password when making changes to their profile or uploading an avatar. We're working on it and it should be fixed soon. Until then, you'll just have to confirm your password with changes.