To add/modify the photo that shows when someone does an Agent Search or clicks on your information at the bottom of your listings, do the following:
Go to Add/Edit and click on Edit existing in the Add/Change Agent Photos & Access section:
Enter your agent ID and click Modify:
Click the Manage Photos link in Other Options:
Click Browse to search your PC for the photo you want to use:
Don't forget to click Save when you're done.