This is one of the better videos about soldering: http://www.youtube.com/watch?v=I_NU2ruzyc4
The UI of these stations are a bit confusing.
To set the temperature, hold ENTER until the numbers start flashing, then use UP to increment the flashing digit, and ENTER to move to the next digit.
Holidng UP puts the iron in calibration mode, which allows you to input the current temperature of the iron, to program an offset. Use a soldering iron thermometer to determine this temperature.
To avoid accidentally putting the irons in calibration mode when trying to set the target temperature, we have enabled the password lockout on them - a code is required to enter the calibration mode. the code on all three of our irons is “abc”
The soldering station should now return to normal operation, with factory calibration.