From LedHed's Wiki
Overview
Some useful command line options for devices running Tasmota firmware
Console
Open the device's webpage, and click the 'Console' button. At the console enter your commands. Commands are automatically saved and should survive a reboot.
SetOptions
https://github.com/arendst/Tasmota/wiki/commands#setoption-overview
Temperature Units
To set temperature units to Fahrenheit:
SetOption8 1