How do I set up a brand new monitor

Plug it into any USB power. The first time it powers on it makes its own temporary wifi network called plantsense followed by six characters. Join that network from your phone, and a setup page opens where you enter your home wifi name and password. The monitor then restarts and joins your home network.

Once it is on your wifi, open a browser and go to its name followed by .local, for example plantsense-a4b2c3.local, and you will see its page.