Backend Plugin Configuration
This section is taken straight from the project README.md on GitHub
Log into your “backend” and go to Settings → November Gallery to configure your defaults. Things to look out for:
SettingsTab: Select the folder that you created your galleries under from the Base Media Folder drop-down, you can also select a default layout for your galleries.
ThumbnailsTab: It is recommended to use the image resizer to automatically generate thumbnails of your pictures. For this, make sure that the “Use Image Resizer” option is ON on the Thumbnails plugin configuration tab. You can also set either the width or the height for your thumbnails here.
AdvancedTab: Inject UniteGallery Assets should probably be on. If your theme already includes jQuery, then you can set Inject jQuery to OFF.