I set up my printer on my old iMac years ago. It prints and scans fine wirelessly. I want to use printer on new iMac. It will print with USB cable, but not scan. I need to do both wirelessly. Don't know how to add this. Can't find old instructions and printer is now out of warranty. New iMac does not have disc drive to install like I did on old iMac. Any help much appreciated.