Documentation: install and update the extension
Documentation: create slide and insert in editor
Documentation: basic layers and its parameters
Documentation: JoomUnited gallery and Iconfinder integration
Yes it is! You just need to use the editor button to insert any slideshow instance in your content.
Yes, JU library image licenses allows you do any type of use.
Images from JU Library are limited to active members (with an active membership). Once image image are downloaded they are stored on your server so if you membership expire you slideshow will remain the same.