Weather Display and Froggit WH3080

I would like to configure my Froggit (FineOffset) WH3080 on Weather Display but I do not know how to do it.
I find it difficult especially in the management of atmospheric pressure. In fact, the weather display shows its absolute pressure (at zero) on its interface but I would like to see its relative pressure (at the station’s height).
Can anyone tell me how to do it?
Can anyone give me the complete procedure to configure this kind of weather station?

you can set a barometer offset in the weather display software