A answer seems missing on this very straigth and basic forward question. It is well documented in plugin manager description.how do I get them to Work under my buttoms
Suppose "Buttoms" is pages in your sites menu.
After upload of the plugin you can select PLUGINS in admin menu.line in top of the admin screen,
Check in the manager status that plugin is activated, and then select the plugin (fotoboxes as example) in the drop-list of plugins from menu PLUGINS
Select plugin-config and check the datafilepath, ftp-upload a folder with appropiate photos to that path and the name of the folder will be name of gallery.
In EDIT GALLERY you can select the gallery
Finally and also first select PLUGIN HELP with detailed description and copy-paste example of the plugin shortcode you shall paste-adjust where you want your gallery to show-up.