Hi, montyny!
Thanks for joining the Canon Community Forum. "MF720C" refers to the "family" this printer comes from. It's marketed throughout the world with as the MF72xC, with the "x" being replaced by a different number in each region of the world. The USA models from this family are the imageCLASS MF726Cdw and the imageCLASS MF729Cdw. If you bought your printer from a Canon USA authorized dealer, odds are it's one of these two models, and this model number should be clearly indicated on the printer's outer casing. This is why you won't find "MF720C" on our site. We hope this clears up any confusion.
If you still need help switching to PDF scanning, finding the right apps on our site, or anything else, let us know and we'll help!