User Activity

Cannot scan using printer buttons.  Works fine to copy and print.  When trying to scan on printer, get message"set Printer to start Scanning"  I can scan from the computer by going into the scan utility. This is a new computer.  
Get message "set PC to start scanning. I can copy, I can actually scan If I go into utility scanner, but I can't just put something on the printer to scan.  then I get the message, set PC to start scanning.how do I do that