Board Thread:Questions and Answers/@comment-32627130-20170731030840/@comment-32273412-20170731230312

The floater island? That teleporter is a "slave" teleporter, so ion crystals can't be inserted. The "master" teleporter is located on the mountain island. If you're not getting the prompt for the mountain island teleporter then I can't help much. (Make sure you're in the stable version of subnautica, and make sure you are holding the ion crystal in your hand)  If you can't find a solution press F8 and report it as a bug.