Uniden XSA1255 Series Owner's Manual page 26

5) Store Number is displayed. The cursor flashes indicating that the
phone is ready for the number to be entered.
6) Use the keypad to enter the phone number; each number can be up to
20 digits. If you need the phone to pause during the dialing sequence,
press the redial/pause key to insert a two-second delay between the
numbers. You can enter multiple pauses to increase the delay. Each
pause counts as a digit. The display shows a P for every pause.
When storing numbers into memory, if the handset is idle (i.e.,
no key is pressed) for more than 30 seconds, it will beep rapidly,
and the phone will return to standby mode.
7) Press the memory key. You will hear a confirmation tone, and the
following screen appears. Memory storage is complete. After about 2
seconds, the following screen displays all the speed dial memory
entries.
8) Press the end key to exit memory set up mode. The phone returns
to standby.
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