[kiwidude]

@cklls - sounds like your configuration is missing. That you can see the remove menu option is a bug which I will fix in the next release.

If you choose the configure menu option, does it list your device? I am guessing it doesn't - plug it in and add it. Alternatively you could post the contents of your "Book Sync.json" file, you can get to this from Preferences->Misc->Open Calibre configuration directory and go to the plugins subfolder.

Of course you might be in the situation of upgrading from a much older version of Book Sync as happened to kenr276 in the last page of posts. See the very first post in this thread for how to setup your device, effectively you will be a "first time user".