At your profile page there is a block which could be filled with your personal info.
See an example of the such personized profile
You can edit the content of this block after reaching rank of "believer" (i.e. solving 25 problems).
To update info, go to your settings page (click the "wrench" at top menu, on the right - or use the link from profile). Here is the textarea for filling your personal info.
We use makrdown language for formatting here.
You can read about its simple rules in the article about Markdown.
Here is an example of filling personal info:
**IT-enthusiast and dreamer**
Author and developer of the **CodeAbbey** since October 2013.
Currently employed at [DataArt](http://www.dataart.com) as backend java developer.
Here are my github projects: [http://github.com/rodiongork](http://github.com/rodiongork)
The result you can see at the example profile given above.