Add Hyperlink on front end, changeable in Admin Panel

Please see Members section on right side of [login to view URL] I have a site similar to this that i want to add a hyperlink to for each entry (15-20 currently). On the front end there should be a link which says "click here to view school website" and in the admin panel a place for me to add the hyperlink. I should be able to "edit" existing entries to add this hyperlink, and also have the option to place it with new entries that i create in the future. The site is php, mysql database