I recently had to rebuild the computer and reinstalled the photos. I have the pictures imported into Lightroom, but the settings associated with the photos, ie. when they were developed, are not there. How to import these?
You need to open the same catalog which you was using before you reinstalled the system because that catalog files has all the changes you made.
Once you open the catalog and re-link the images.
LR by default stores all edits in the catalog file, not in the images. So if you have a backup of your original catalog you need to copy that over to the newly rebuilt system and open it in LR. You then might have to Relink the images to the catalog depending on where your images are and where the original LR catalog thinks they are.