You need to get out of “Discussions” to search for equipment.
Click on the Down Arrow next to “A” (in yellow circle) at the top of the page and click on the top selection (Largest high end community), or click on your name in your post (or mine, then Details) and then Marketplace Feedback…any of these will change the search box at the top of the page from “Search discussions” to “Search equipment or”…
At least that’s how it works for me using iPad.