Hi soilime,
first identify the IP from your Shelly 1.
In the App - settings - device info - device ip
All available http commands you find in the lexicon here:
https://shelly-forum.com/lexikon/index.…quest-shelly-1/
This commands you can configure on the button 1.
Try first a simple command e.g. toggle the light
Replace 192.168.xxx.xxx with your IP from your Shelly 1