Hello, I'm Jason.I will do my best to answer your question quickly and accurately using the information you have provided.
You will notice that each of the plastic line fittings to the fuel filter have locking tabs. These need to be pressed inward (pinched) as you lever slight pressure against the line (away from the filter) using a screwdriver or similar. Sometimes, needle-nose pliers work well to pinch those locking tabs.
Ok, where I have the yellow arrow....push in there, while lightly prying against the line at the red arrow.