You create tabs by including plugin calls like this in your articles:
{tab title="Tab 1" class="blue"}
Tab 1 content.
{tab title="Tab 2" class="red"}
Tab 2 content.
{tab title="Tab 3" class="green"}
Tab 3 content.
{/tabs}
There are a few additional options, all described in the free PDF user guide.
Read more https://extensions.joomla.org/browse/new/extension/news-display/article-elements/simple-tabs
