Here's what I'm seeing. I'm using Firefox 123.0 on current Windows 11. I have BEE installed and enabled (and a bunch of tabs open). BEE is active for the WikiTree, Find A Grave, and Family Search tabs, but it's grayed out for other tabs (that are not genealogy related). If I go to my father's or Star's father's Find A Grave memorial, I don't see any link on the memorial page, but if I then click on the BEE icon, I get a new popup window that shows the Find A Grave source citation, birth, death, and burial data, a couple of other things, and a line labeled "MergeEdit (WikiTreeID)," followed by a box showing the person's WikiTree ID and a link labeled "Go." That link then takes me to the WikiTree profile.
If there's something more straightforward, I'm not finding it. If what I'm seeing tracks with everybody else's experience, I think it might be beneficial to fill in a few more details in the instructions.