To view the customization options for your finished story, click on Post, Share or Update in the top right corner of your editor (what appears on your screen depends on the state of your current story).
Note: If you're using Enhance, you can also click on Options > Embed Options from the Enhance menu on your page.
In the Share panel, select the 'OPTIONS' link.
This will open the customizations panel. Select the desired options for your story by ticking the boxes next to their description.