The system manual doesn't show any personal speed dialing, Don't have a phone user guide but it does show system speed dialing. I find it hard to believe that it doesn't have personal speed dialing.
Most of the systems use ITCM **2 then 0-9 on the key pad or **1 and a unused button on the set then the number, then SPKR to end. Give that a try.
I can e-mail you the system manual if you would like.