Click on either the small photographer icon below the photo or "View all photos by this person"
This is your page, which displays your name, biography and all the photos you have available for sale
Copy the link to that page from your browser, e.g. http://www.stockexposures.com/view_photog.php?photogid=12 (The number at the end being your own personal photographer ID no.)
The link on its own is a bit long so you can format it to display a neat link to your portfolio as follows:
<a href="http://www.stockexposures.com/view_photog.php?photogid=12">My portfolio at Stock Exposures</a>
All photographers are encouraged to fill in a few details in your biography section (edit profile) as buyers will be interested to learn about who the photographers are and where they come from etc.