1.  Tag Groups taxonomy settings and select the taxonomy (tag type) of your tags. In most cases just leave the default: Tags (post_tag).', 'tag-groups'), 'href="' . esc_url($settings_taxonomy_link) . '" target="_blank"') ?>
  2. create some groups.', 'tag-groups') ?> Tag Groups home page.', 'tag-groups'), 'href="' . esc_url($settings_home_link) . '" target="_blank"') ?>
  3. assign them to these groups.', 'tag-groups') ?>