GRE PSR-500 Owner's Manual page 84

Use the  or  keys on the 5-way pushbutton pad to scroll to
the desired SAME code entry.
SEL
Press the key on the 5-way pushbutton pad to edit the
selected SAME entry. The scanner display will appear as follows:
With the Entry: field selected, press  on the 5-way
pushbutton pad to turn the entry on.
PSR-500 User Manual Page 84