Go to Printers in Settings
Go to the Printer you want to put the separator page on
Click Manage
Click Printer Properties on the left hand side of the screen
Click Change Properties
Put in your admin information
click Advanced
On the bottom of that box, click separator page
Click Browse
chose the 2nd to last one\
Press Open
click ok
click apply then okay. If apply isn't an option just click ok
Close the printer boxes that are open