If you haven't done so already, create a Typeform account and create a typeform.
Back at Gridbox Editor, drag and drop Typeform from Components panel -> Integrations
Change the button text if you want to. (Click on the button and click on </> icon from the blue highlighted toolbar -> change the text and save)
Click on settings icon from highlighted toolbar wrapped around the selected button or open the properties panel from the left sidebar.
Enter the typeform form id - when you click on the publish in the Typeform, you will find this id in the generated form link.