I have a manual, from page 3:
Send key: Press to initiate or to answer a call. Press for switchhook flash during a call. (Also used for Automatic Redial.)
M1 key: Press to scroll through QUICK DIAL-1. Press to decrease speaker volume during a call.
M2 key: Press to scroll through QUICK DIAL-2. Press to increase speaker volume during a call.
D key: Press to scroll through Voice Directory
END key: Press to terminate a call, or press and hold when not in a call to dim the controller illumination.
From page 7:
Storing Phone Numbers: Enter telephone number + [Store] +two-digit memory location at the handset.
You can enter names also, but it's too much for me to type
If you wait until Monday, I can send you a .pdf version of the entire manual.