A Gallery is a group of images or albums that you can have on your store. You can create albums and upload pictures.
To find where you can configure your gallery navigate to ADD-ON's > GALLERY > CONFIGURATION. All settings in the configuration area are customizable. Once you have made the changes click on Save Config.
To create an album you would go to ADD-ON's -> GALLERY -> MANAGE ALBUMS. Once you are there you would click on ADD CHILD ALBUM
From there you would be able to create a name for your album and add a short description. For your Album to show online you would need to set it to active.
Here you will see where you would go to set your Album to ACTIVE which will make it viewable on the frontend of your website:
Once you have set the new album to active you can begin adding images to the album. To do this you would go to ADD-ON's >GALLERY >MANAGE PHOTOS Click on ADD NEW PHOTO. You also want to set the image to APPROVED so it will be viewable on the frontend of your website.
Once the image is uploaded you can assign it to an album by clicking on the tab on the left-hand side that says ALBUMS. You would check the box of the album that you want the image to show up in.
As always, after your changes are made, be sure to save them. Once saved, flush your cache and reindex.
SYSTEM > CACHE MANAGEMENT.
Select Flush Cache Storage at the top right of the page.
SYSTEM > INDEX MANAGEMENT.
Select All, Submit next to Reindex Data at the top right of the page.