There are a few things to do to set this up, you will have to do this in order as each step will lead into the next.
1. Coruscant Federal District
Get the password, this is marked with a yellow key in the lower left of the map. Protocol droids will keep passwords so don't worry about memorising it.
2. Jakku Tuanul Village.
Complete puzzle: Dodgy Dwellings
Complete side mission: Dodginess Manifest
3. Tatooine Jundland Wastes
Complete side missions:
Probes and Cons
Rodent Retrieval
That Droid is the Pits
Protocol Recall
For OOM the Bell Tolls
Don't Be Afraid of the Dark-Eye
Droids Have Madnitude!
Battle Droid Royale