After taking out the first target, you need to extend out to sea and come around for another pass. Note that in this lesson, you're using the MAV optical sensor to view the target, not TGP.
Make sure Waypoint 3 (Range) is your current steerpoint, and with the MAV display as your SOI, press china hat forward long to slave the MAV to the target area.
Note that the second MAV is the AGM-65D with an infrared seeker, so you must turn on your laser (front left panel) or you won't be cleared to fire.