You can open the Flickr export dialog via one of the following methods:
Click the Save Video drop down button. Select the Flickr option.
Click the Save Video... menu item and in the wizard that opens, select the Upload, then the Flickr option.
Once reaching the Flickr export dialog, you can choose assorted settings that will be applied to the exported project.
After making your selections click on Create, to being the export and upload process.
If required, the Flickr Authorization dialog will appear and your web browser will open, allowing you to log in to the service.