1) You can the slider by using the Page Builder => Swift Slider or you can edit a page and within the Meta Options for the page, you can add the slider there also.
2) Not 100% sure what you mean here, can you screenshot what you refer to?
3) You can the slider by using the Page Builder, the assets are called “Products” and “Team Carousel” or “Team Gallery”.
4) Have you read over the docs: http://dante.swiftideas.com/documentation/
5) I think ThemeForest offers a service to do this, the same as they did for your installation. – We did not do that for you.
Thanks.