Please click on file>Auto Import>Auto Import settings
and set the watch folder to your scanner location.
Please refer to below thread for a screenshot of the process.
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Your scanned files are files on your computer, like any other files. So just point Lightroom to the folder where they are, and import.
You can't scan into LR, if that's what you had in mind.
That's what I did with a big project at work. I had to scan nearly 12,000 images. I simply scanned them as TIF images, saving them in folders. Then I imported the folders into Lightroom. Didn't even think about using the auto import feature. It was just too quick to do it the way I did it.