After impersonating Jimmy Siska over the phone to delay the auditor, head to the marked location to find a DedSec ally. Talk to him to get the mission started. You don’t really need to do anything else; after the cutscene, this objective will be complete.
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After making a call to Miranda, drive to the beach near the New Dawn facility to meet up with her. After talking to her, you should need inside the restricted compound. When you’re right outside the restricted area, deploy your quadcopter and scout the enemies inside. The compound has a lot of objects where you can hide for infiltrating but it's always a good option to have your quadcopter drop ESD and IEDs from the air as well as activating lethal and non-lethal proximity traps to lessen the number of guards who might spot you. This type of approach keeps you safe from detection and also makes the mission a bit easier by eliminating the guards without your direct contact.
First of all, you have to find one of the two sources of the access key that will allow you to remotely open locked doors and gates. Jimmy Siska is held captive in the room to the southern end of the compound but your main objective is to steal the registry of occupants inside the house in the middle of the compound. After checking out the registry, you have to bust Jimmy Siska out next. If you cleared all hostiles in the area through sheer force or through drone bombing, then you just need to simply walk to the room where Siska’s held then leave the mission area to complete the objective.