Step1: Choose the template to start with and get into xFunnels builder.
Step2: Click on the block where you want to have heading. After then, go to the 3rd tool of the toolbar at the left corner of your page. This tool reads 'Headings'. Click on it and the heading will be inserted into your page.
Step3: To manage your heading settings, click over your heading and you will be provided with the toolbar at the right corner of your page to deal with all your heading settings.
Learn more through the video: Coming Soon