There aren't any formal agent roles in Jomres, instead Property Managers are considered agents.
An Agent/Property manager can update their publicly available details by completing their account details in the Main menu.
It's possible to view an agent's profile, but it's not normally available by default. To view it, you can visit the task directly by doing something like
http://joomla-portal.jomres.net/index.php?option=com_jomres&Itemid=103&lang=en&task=view_agent&property_uid=1
Assuming you've got the ASAMambot plugin installed, you could also add this as a shortcode to an article by doing something like
{jomres view_agent &property_uid=1}