Available on the Awesome plan
To install the Floating Reviews Tab:
From your Shopify admin, go to Online Store > Themes.
Find the theme you want and click Customize.
Click the App embeds icon (third one on the left panel).
Enable "Judge.me" and "Reviews tab".
Expand the Reviews Tab app embed to choose its position.
Click Save.
To remove the Floating Reviews Tab:
From your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit and click Customize.
Click the App embeds icon (third one on the left panel).
Enable "Reviews tab".
Click Save.