Adding a password to your slideshow will make it private. Only those with the password will be able to view the slideshow. There are two ways to do this: 

1. During initial slideshow setup

When you begin a new project, you can add a password for your slideshow in the Advanced section:

2. While editing your slideshow

Click on the Gear icon next to your slideshow's project name at the top of the page as you are editing your slideshow:

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