Need help file

I’ve got NextGen installed, but I can’t figure out for the life of me how it works. I spent about an hour today uploading images then clicking endlessly to try and do things and never seeming to find anything that works. Yeah I’ve got an album, but what do I do with it?
I can’t find the downloadable documentation either and that would be a massive help, can anyone point me to the link?
All I want is a collection of albums, but with the ability to add text to some of the photos.

https://www.ads-software.com/plugins/nextgen-gallery/