The manual for the Magic Chef MCD1311ST Microwave can be downloaded in pdf format from the following site (follow the link then click the "Manuals" tab):
If you don't have time to download, here's what the instructions state:
SETTING THE CLOCK
When the oven is first plugged in, the display will flash ":0" and a tone will sound. If the AC power ever goes off, the display shows ":0" when the power comes back on.
1. Touch CLOCK pad.
This is a 12 hour clock system.
2. Touch CLOCK pad once more.
This is a 24hour clock system.
This oven has multiple clock system. If you want 12 hour clock system, omit this step.
3. Enter the correct time of day by touching the numbers in sequence.
4. Touch CLOCK pad.
The display stops blinking, and the colon start blinking. If you selected 12 hour clock system, this digital clock allows you to set from 1:00 to 12:59. If you selected 24 hour clock system, this digital clock allows you to set from 0:00 to 23:59.
5. Touch STOP/CLEAR pad.
If you attempt to enter an incorrect time, the time will not be set and a error signal tone will sound. Touch the CLOCK pad and re-enter the time.