KindleGen issue

I’ve downloaded KindleGen to my hard drive, (C:\Users\Jake\Downloads\kindlegen_win32_v2_9), but I don’t see any “choose” button to click to tell Scrivener where it is. I’ve installed and uninstalled it (and Kindle Previewer) 3 times. I have Windows 7 and use Moxilla Foxfire. Tearing my hair out in chunks. Please help before I’m bald.

Go into File > Compile.
Select Contents in left column.
Set/select Compile For: to “Kindle (Mobi) Book (.mobi)”.
Select the KindleGen entry that just appeared in the left column.
Click the Change button that appears on the right.
Navigate to and select the kindlegen.exe executable.