With the cursor on a specific day (the cursor will always start with MO), press the plus (+) button to activate a particular day of the week to water. Press the minor (-) button to cancel watering for that day. After pressing a button the cursor automatically advances to the next day.
Repeat step 1 until all desired days have been selected. The selected days will show a to indicate their status is "ON". The last is the last day of watering for that program.