How can I link an image of a jCarousel to a certain link?
I assume you're using views and jCarousel and Drupal 7.

On same content type that you have your image fields, add a new link field. Add this link field to your view but check the Exclude from display checkbox, set the Formatter to URL, as plain text and make sure the link field is before of your image field in order.



Edit your image field settings in the view and, under Rewrite Results, check Output this field as link. Scroll down to the replacement patterns and copy the pattern that references your link field. Put this pattern in the Link Path text box.