1. Stand in the same location as the NPC
2. Click on the position buttton in the right hand menu
3. Click on party
4. click on the white box for the NPC
5. Click on add (The NPC is now a member of your party)
6. Enter the ship, the NPC will follow.
By the way, this also shows you how to form and manage parties.
Warning this is strictly Orions McPhees Opinion, it may or may not have any bearing on events true or imagined