Gallery comes with a flexible method of displaying Joomla galleries at the frontend. You can easily add the gallery to any part of your website. Joomla Articles, Custom HTML Modules and 3rd Party Extensions.
Open the Joomla article, custom HTML module or 3rd party Joomla! extension, and at the editor panel click on the button "Gallery"
Select your gallery from the list and click the button "Save"
NOTE: You also can to insert gallery shortcode [gallery ID=1], where 1 - it's ID of your gallery.