How to add Canon TR7520 printer to iMac?

I have a Canon TR7520 printer, and an iMac. It was connected to my iMac, then I changed internet providers, got new modem, new wifi address. I could not figure out how to change the wifi and searching on-line did not help. I have now deleted the printer from my system, and want to add it back in. This is where I am now having trouble. The printer window says to follow the instruction on the computer or smartphone. I can't find any instructions.

Will someone please help?