Hello and thank you for your question. I look forward to assisting you today. Do you have the Canon software installed on your computer?
If not, connect your computer directly to the scanner using a USB cable. Both should auto detect. Let me know when you have done that please.
Okay then switch to scan mode on the scanner.
Once you have made the switch, select Computer as the scan type as it appears in the display of the scanner. Once that has been selected, specify the scan settings of your choice. Press OK to start.
Please let me know if you need further assistance.