This feature can be enabled by users with Manager-level access or above. 

Click Location Settings > Video Settings > Sales / Service / etc (choose the department you want to add the review button to):

Then, scroll down to the Thanks For Your Business video type (the Leave a Review button can only be added to this type). 

In the 'Leave A Review Button' field, enter the URL you want the button to send the user to:

You can enter any URL for the button depending on where you want the customer to leave their review. 

Example:

Here's how to find the URL for leaving a review on your Google Business Page:
https://support.google.com/business/answer/7035772?hl=en

You can also link to DealerRater, Facebook, Yelp, or anywhere else you want a customer to leave a review.

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