Make sure to re-wrap the Antenna/iSight cables back with some tape. If your replacement part did not include any, reuse the one you took off. My replacement part came with tape, but I still put a bit of Kapton tape around the black tape to completely close the fold.

The new antenna hopefully came with the small grounding straps that go around the cables, and get screwed in on the far-right of the display. If they didn't, you'll need to remove them from the old antenna.

Insert the replacement board starting with the far-left side. Once inserted, the board should sit loosely in the grooves of the display.

When installing the new antenna, first screw in one of the six center screws -- that will help align the far-left screw over its hole.

Be very careful when reinstalling the plastic cover for the antenna. Mine was already brittle and crumbling, and I had to super-glue some pieces together after reassembly.