Images in your collage can have text descriptions. These appear as labels for the images when you export your collage to an HTML page or to email.

In addition, you can turn the images in your collage into clickable regions which link to pages that you define. You may have to click the three-green-arrow button to see the box into which you can enter the link.

To set these options on an image, select the frame and press Alt-D
or right-mouse-down on the frame and choose 'Update Description' from the contextual menu.