Navigate to Tools > Import > WordPress and import your XML file.
Note: Import will take 5 to 10 minutes, depending on your internet speed. You will receive a success message on the page after successful import, do not refresh or go back while import is in progress.
Important Notice:
The XML file will import only the content from the demo, so you'll have to configure Menus, Widgets, Theme Options manually after that depending on your theme features.