Predefined templates will make your life easier and campaign faster. First, pick a template using the corresponding menu item, then change its color from the toolbar (envelope icon ✉ ). Now text and photos can be edited easily.
Social media links can be specified once at the corresponding place (Settings → Social links). After that, they’ll be automatically used in the footer of the template.
Once you compose a perfect email, you can save it as a template using 'Save as template' button.