You can view these instructions in a PDF file or watch a one minute recording. 

1. First, click on the person icon at the top-right of the screen. This will bring up your user profile and you will click on Feature Rollout Preferences.

2. From there, you can click on either of the toggle options to turn the feature on or off. There will be a date of when the full activation will occur where you no longer have the option to not switch to the new feature.