Or you can link from only a small part of your picture. I'll show you how to do this in the picture of the private beach.
Click on the picture. At the bottom of the screen some new options will open up, including some green shapes at the bottom of the page. Click on the rectangle. Go back to your picture & click & drag that rectangle onto your picture. A link box will open up. Insert a hyperlink address http://en.wikipedia.org/wiki/Animal_shell into that box.
Click File-->Save
Click File--> Preview in Browser & confirm that your link works.