[A Lurker]

I'll apologize in advance for asking such a rudimentary question . . . being that my question is so basic, I assumed the answer would be easy to find, but my research skills have failed me.

I would like to import books I've purchased with the Kobo Windows desktop app to my Calibre library. I've added the obok plugin to Calibre, so I should be good to go.

When I click "Add books" in Calibre, I'm presented with the file explorer popup window . . .

What do I do next? I have no idea where to find the actual ebook files.
There's no obvious Kobo download folder. Which means I don't know where to point Calibre.

In other words, where on my PC are the Kobo books I purchased and download with the desktop apps? I need to know their file location to be able to import them into Calibre.

The general "read me" text that comes with the DeDRM tools simple says: "[The obok plugin] finds your ebooks downloaded using the Kobo Desktop app [...] For instructions, see the obok_plugin_ReadMe.txt file."

The "read me" text that comes with the plugin says: "Select the plugin's menu or icon from whichever part of the calibre interface you have chosen to have it." This really confuses me. I don't see a menu for the the plugin within the Calibre interface. And I've not chosen where it's displayed in that interface.