There have been a few questions on how to navigate to the modify profile optionsTo access your user profile, select the profile tab at the top of the screen
Scroll to bottom of screen and select any of the 9 settings under the Modify Profile tab.
Account Related Settings- This tab includes you log in information, email, and password. To change these settings make your selection, scroll to the bottom of the page and select Change Profile.
Forum Profile Information- In this section you can change your personalized picture, personal information, add IM username, change your custom title and signature.
Ultimate Profile- In this section you can add more details about yourself. If you aren't comfortable with sharing some information, simply skip it - nothing here is required.
On this page you can select who sees your ultimate profile, or if you want to disable it all together. You will put information you want to share with others here.
Look and Layout Preferences- In this section you can change your smiley set. As well as how the time is displayed and other misc options about the boards.
The last three are fairly self explanatory.
If there are any questions on how to change a option in your user profile please PM a mod or ask here.