Hi there. Ok the root path for Images is usually something like Portals/0/Images. When you import the content this value is replaced in the imported XML with the value in you enter. this gives you the ability to move content from site to site.
Upload XML allows you to upload the XML content.
Uplaod images allows you to uplaod a zip fo the images for the content.
You can prepare your content offline in a local version of the Help on a DNN site, export it, then import online just like we do for the online Help.