After installation and activation of the plugin, it is better to begin by importing the example Demo Calculators. You can check sample ready-built calculators in order to get how the process is going on.
Go to My Calculators section
In the Modal popup click on the Import Calculators button
Choose Run Default Import option
You will see the importing progress
After import completed You will see the list of the demo calculators
When you have calculators made in the Cost Calculator Builder plugin, you are welcome to import your old work. For that, you should choose your calculator file from your local folders to import it.