Hi. I am new to this myself and have only had the system for about a month. I currently have only three zones and have set them up for daily morning watering. I have smart zones disabled in each zone.
Under Preferences / Settings - it has a Weather Conditions area.
Under Rain I have the Strategy set to Expectation,
The Threshold set to 5mm (I actually think I should reduce this to something like 2 or 3mm)
And
I found a way to manual skip a scheduled day. In the Schedule tab under the month view it lists the schedules for that day. You hit the gear on the right for a certain zone and you can select skip this zone or skip all zones.
But once you do that it disappears from the schedule and I can not see a way to get it back if you click it by mistake.