To start you have to create a javascript file inside of the breeze scripting folder. You can find this folder in two ways:
Pressing the icon inside of the breeze scripting tab.
Or manually manouver to the appdata folder, the same folder where .minecraft is. In the folder navigate the following path to find the breeze scripting folder -> breeze/1.8.9/scripts
In the scripts directory create a file with the name of your script ending with .js.
The script name that shows up inside of breeze is defined by what you name the file! For example calling your file PingSpoof.js will make the script show up as PingSpoof.\
Script Description
To start your script we can use the script to set the description for the script.
script.description="Test description for this script";