Recording a personal outgoing message (Greeting)
1) Press and hold the greeting key. You hear the announcement “Record greeting” and a confirmation tone. [--] flashes on the message counter.
2) Start recording your message. You have 30 seconds, and the message counter starts
to count down [30 ] to [1] every second.
3) When you are finished recording your greeting, press the greeting, or set key.
You hear a confirmation tone, and then your greeting plays back for you.

Please see your owners manual for instructions on recording your greeting.  http://www.uniden.com/index/manuals_results.cfm?cat=1