If you’ve completed the previous parts of this quest, you should get the Email "I’m free!" from Keri after completing "The Journey to Meridian". If you haven’t been keeping up with this quest, it should be noted that it updates periodically after completing story-related quests, then goes dormant. Despite this, if you’ve missed previous phases of the quest, you can return to them and complete a number of them all in one go. Amazing how Keri finds the time for you like that, huh? Just check your Email for correspondence from her, visit the Nexus, chat, then return to the Tempest and check for more. Only the fifth part of this quest can be tricky, in that you’ll often get the Email only after visiting the Nexus and talking to Hakim Barakat, Keri’s producer, who can be found on the Docking Bay/Common Area.
Anyways, this phase of the quest is incredibly short and simple, just head back to the Docking Bay/Common Area of the Nexus, make your way up one of the ramps near the merchants and find Keri near a railing east of the door that leads to the Tech Lab. Her struggle between propaganda and the truth continues, and depending on your response she’ll tailor the raw footage of your assault on Khi Tasira. After that, the quest goes dormant yet again.