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