Once a project is complete, it can be exporting by going to File > Export > Media. In the export settings, the user can adjust the format and video file. There are also a list of presets that will allow for optimal exportation for pages like youtube and dailymotion and vimeo.
For a tutorial on exporting Premiere projects, click the Lynda playlist below.
Lynda Playlist: DLL Adobe Premiere Exporting: