Congrats on installing and customizing your widget! You've come a long way.
The last step is to test your widget to make sure that it's working well.
Navigate to "Widget Settings" > "Installation"
Step 1 - Click on the test widget at the bottom right hand corner.
Step 2 - Input a random phone number in the popup
Step 3 - Success
If you see the "Call Testing Success" message, the call's successful and the widget's working!