The soil moisture sensor has been loaded the firmware before shipping and it is ready to use as getting to customers hands.
Install 2 AAA batteries.
Plug it into the soil, anywhere you would like.
Then it will begin to work, with broadcasting its unique ID and testing data via Lora, in a few seconds, and fall into sleep with 60 minutes, and then broadcast again(in 2s), repeated again and again.
Please check the wiki for the usage detail.