I am adding this ‘How To’ so I don’t have to keep typing it in email

For new stations or just for calibrating open up the ‘Control Panel’ from the top menu.
Select Offsets & Initial Rain.
Select Tab - Temp/Baro Offsets/Rain Totals.
On the left half way down you will see Yesterday Rainfall, Monthly Rainfall and Yearly.
Type in the total you want for the Month or Year and click on Set for each added. Although nothing appears to happen, it does take.
Click on Yes – top right. Close the Control Panel. You should now see those values on your Weather Display Frontend – bottom left.
In the screenshot  below. I have added 60.0mm for the month and 800mm for the year.
Further reading here regarding Correction of Day total, graphs, logfiles.
http://www.localweather.net.nz/smf/weather-display/correct-my-rain-recording-for-the-day/