Add Content to Your Page
Click Add Content and click a basic page or an article.
Switch the Text Format to Full HTML. Paste the following code block into the Body and save.
Edit the POWr YouTube Gallery directly inside of the Drupal page
You should now be able to edit POWr YouTube Gallery right in the live Drupal site. Click the gear icon . This will open your POWr Editor for the YouTube Gallery Module. Change anything you want, from style to contents, in the visual POWr Editor.