From your back-end setting panel, go to: "System > Install > Extensions", browse to com_speasyimagegallery_fullpackage_v2.0.2.zip to install SP Easy Image Gallery Module and Component.
Go to Component > SP Easy Image Gallery to access to SP Easy Image Gallery component.
Click on Tags tab on the left > Click New button and create Tags
Click on Categories tab on the left > Click New button and create Categories
Click on Items tab on the left > Click New button and create Items > Assign to one category
After installing SP Easy Image Gallery Module , go to "System > Site Modules" to find SP Easy Image Gallery Module to edit it.
On this tab, you have a lot of setting options to configure the module as you want.