Select the button you want to link and click to Edit button.
Within the General tab, you can link your button to a particular page on your website, a URL, a phone number, or an email address.
When you're done linking the button, simply close the Button settings and your changes will be saved automatically.
Link to page: links to an internal page within your website.
Link to URL: links to any external page/website/platform etc.
Link to phone: links to a phone number; once anyone clicks on a button, the number is auto-dialed.
Link to email: links to an email address; once anyone clicks on a button, the email app is automatically opened.