Use the administration settings first for logos, design selection, pages, posts, menus, ad placements, and trusted integration snippets.
Do not edit an included theme directly, because an update can replace it. Make template, CSS, or JavaScript changes in a v7 custom frontend theme. Its directory name must be lowercase and end with -custom. Build and test it outside production. Then keep both its source directory under private/resources/themes/front/ and its compiled directory under themes/front/ in every backup and deployment.
Legacy AdLinkFly 6.6.5 CakePHP themes are not compatible with the v7 theme system. Recreate required changes as a new v7 custom theme and follow the full custom-theme procedure in the buyer documentation.