First, pair the sensors with a base station.
To do so from the Aranet Cloud take a look at this forum post: https://forum.aranet.com/aranet-cloud/aranet-cloud-base-management/
Then go to the specific sensor in the base management from Cloud section and edit the WET150 sensor:
From here you can change the VWC calibration profile and the Pore electrical conductivity calculation model.
If you want, you can turn on the "Advanced parameters" option and change the constants of the models.