An easy way is to create an Administrator Account on both machine and give them the same name and password, then use that to add/share the printer.
You don't have to use the above method, because you need to have Administrative/Operator right & password to the Host machine (the machine with printer), and Adminstrator/Operator right on the Client machine.
Easy way:
HostPuter - Admin/Pass
ClientPuter - Admin/Pass
Slightly harder:
HostPuter - Admin/Pass
ClientPuter - Administrator/Password
This way you have to give the Admin/Pass when try to connect to the share printer.