Hello smaniapik,
I would first make sure you are logged in as the Admin. Here are the full steps for adding a contact to your device.
I am unable to add contacts, it does not give me the option. We have a xerox Versalink B605/B615 Multifunction Printer
Initially I was able to add contacts, but that option is no longer available.
We also have contacts for the scanning function, but I need to remove some people and add new ones.