I haven't done this procedure in quite a long time so the details easily retrieved from my memory. However, I can say that my initial writeup on the procedure is detailed. The following excerpt from my writeup addresses your question I believe.
7. The other side of the fuel filter has two in/out lines attached in a different manner than the side already discussed. The two line side uses red plastic clips to hold the couplers onto the filter connections. The clips DO NOT necessary just unclip then you go happily on your way to replacing the filter. It was this side that caused the most grief for me as I did not completely understand nor visualize how the clips work. You will want to make sure the clip is pointing toward you (down) with the red portion fully toward you. You will notice ridges on a major portion of the clip that look like they are there so your thumb doesn't slip off. This ridged area clips onto the other side of the red area. In other words, the red area is essentially two sides that clip together. The "ridged" side hinges on the side where it appears to make contact with the black plastic portion of the coupling. To unclip this you may try using enough finger force to push down on the small "no-ridged" side while pulling up on the ridged side, allowing the ridged side to hinge outward. Since my hands are too big I used a small flat head screw driver to gently "unclip" the clips. This is done by pushing the screw driver head into the area where it appears the ridged area meets the other side. By pushing into what appears to be a slotted area "in the middle of the red clip" then pulling outward on the rigged side the clip with hinge out. NOTE, you will STILL NOT be able to remove the fuel line coupling off the filter. You have to do one more thing with the red clip to make sure it isn't preventing sliding of the coupling off the filter. With the red clip "unclipped" such that the ridged area is hinged outward you need to push both sides of the red area towards the other side of the black coupler. In other words, the red clip is not molded or permanently snapped onto the black portion. It actually slides to the other side of the black plastic. If the red portion was facing down towards you when you started this proceedure then this means you need to push on both sides of the red clip (after doing the "unclipping" portion describe above) upward toward the sky to get it to slide. Just use enough finger force and it should slide. Again, make sure you have slid both the left and right half of the red clip. Now, perform the same proceedure on the other in/out line. Again, watch out for fuel drips. The filter is full of fuel and may empty on your head if you are not careful.
