Login into MasterGST using same email and password as you registered.
After login, click on the clients in the menu bar.
In clients page, Click on ADD CLIENTS button.
You will get a page with Let’s add a new client as heading.
Enter all the mandatory fields with valid Details.
Enter GSTIN login/user name as you entered while registering into the government website.
If all the mandatory fields are filled then only add button will enable. Else button will be in disabled state. Click on add client, the page will redirect to client details page with added new client details.