This feels dumb, but today was the second time that I couldn't figure it out immediately, so here are instructions for my future reference.
1. Go to the list of printers and scanners
2. Double-click on the HP Photosmart printer
3. Click on the "Scan a document or photo" link
Step 2 was the part that I got stuck on, because I kept on trying to right click, which does not give you an option for scanning.
