Yeah, I had to "figure" that out too, took awhile too for my non-mechanical brain to figure it out.
On the grey plastic cover, push on the left side on the tab (as you are looking at it) towards the drivers side and into the firewall. The whole cover pushes through the firewall. You only need to disconnect the drivers side connection on the firewall and a couple of ECM wire harness connectors
See the tab on the left side of the grey plastic? Thats where you push towards the drivers side and through the firewall. The whole grey plastic pushes through along with the wires.

Hope this helps.

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jetman
Silver 86 SE 2M6 4-speed, with "check wallet light"
Now fortified with 8 essential slices of bacon goodness