Installation all worked fine via the zip and script in this thread: https://www.mobileread.com/forums/showthread.php?t=314220
Unzip the zip script, run the script. Bingo, as simple as that.
Launch koreader from the ‘Nickel Menu’ option in the normal menu.
Go to the spanner and screwdriver icon.
Wallabag / Settings / Configure Wallabag server
save the settings empty to create the settings file, then connect the Kobo to laptop and edit .adds/koreader/settings/wallabag.lua
you need client credentials from Wallabag, which is in My Account / API clients management when you’re logged in. Create a New Client for Kobo. (note… Wallabag doesn’t do OAuth, so you have to provide your username and password too, which is not great. But it’s in discussion.)
Retrieve new articles from server.