how to remove accumulated rain from the meteoxx graph

[Stormedy]

...I recently bought a Davis VP2 where an accumulated rain total was already on display. On the Davis VP2 I was able to remove it. How can I remove this from my meteoxx box where it still shows rain totals. I would like to begin from "zero"...

any simple way, I am not used to program the meteoboxx!

Thanks very much!

Edy