Adding process of Huge-IT Image Gallery Extension
PRO version should be installed straight on the FREE version without deleting it, in order you don't lose your changes.
For installation of Image Gallery go: Extensions > extensions manager > choose the zip file > upload and install
Menu > main menu> choose one of your menu items> select our extension as menu item type>choose the gallery from the list of created galleries
Create Article with plugin
Extensions > Plugins > find our Image Gallery extension > and activate it Now you can use it as article item. While creating an article use shortcode. [huge_it_gallery id="id"]
Copy/paste the shortcode into your article