Press OK, go with the arrow keys to HS SET and press OK, then with the arrow key to FAST SEARCH and press OK, you will see M1, press OK and enter a telephone number and confirm with OK. This number is now stored under the M1 key.

For M2 and M3, when you have pressed OK after FAST SEARCH and you see M1, go down one or two times for M2 and M3 respectively, press OK and enter a telephone number and confirm with OK. This number is now stored under the M key.