1) Click on the presentation you would like to create a PDF for.
2) When inside the Presentation Editor, click the PDF button in the top toolbar.
From here, adjust the settings to get your desired Line Sheet layout.
3) When you have the settings you want, click Download on the bottom right of the settings panel.
By default on most browsers, a new tab will open, displaying the newly created PDF file.
See Download Presentation PDF for instructions on how to download the resulting file from your browser.