If they are in a crate you carry the crate. If they are not in a crate it should function like NPCs do, so you can assign them to yourself and add them to your party.
Edited By: Syn on Year 7 Day 364 18:11 ____________
By clicking party on the position travel screen, selecting them and clicking add to party. Same as with NPC's like Syn just said and the clearly labelled buttons make it quite self explanatory if you look at the screen.
If there in a crate you need to take them out of the crate first obviously.