This information was provided to me by Level II support, because it is missing in the Help file and neither the Chat or Level I support knew how to do.
You can add a hyperlink (speed link) to images and shapes in Presentations, but not to text. Here's how:
1. Add an image or shape to your presentation if one is not present already by using the Insert > Image or Insert > Shape menu item
2. Right click on the item and choose "Speedlink..." from the context menu
3. Select Action, and change the dropdown to "Browse Internet"
4. Add your internet link to the "Location" box
5. Click OK.