If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
You need to add the link in Cu3ers config.xml file. I think an example code (example slide with link and transitions) can be found in config.xml too.
No clues in the config.xml file as to how to link, but went onto the cu3er support forum where some kind soul put me right. If anyone else is stuck the usage is:
The topic ‘Adding links to images in Flash slider and Cu3er 3D’ is closed to new replies.