On my computer, the 3.8 mm screw was near the midpoint of the subwoofer (left-to-right in the photo) and near the bottom. The 5 mm screw was top right of the subwoofer.
Push it straight down. It should snap in.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.