This seems to be what you are looking for: http://blog.indeed.com/2015/03/05/responding-to-company-reviews-2-examples-from-real-employers/
Excerpt: To begin responding to your company reviews, you’ll first need to claim your Indeed Company Page. Search for your company and select “Business Owner?” on the Company Page. Once you’ve been verified, navigate to the Reviews tab. There, you’ll be able to leave your responses to the reviews people have written.