Reviews are added manually within property setup. Go to Properties > List all Properties, edit the property and look for the Reviews tab.
Click "Add Review" to add a new review for the property to Lodgix.
If using the Lodgix Wordpress plugin, reviews will show up on your website for that property the next time the Lodgix updates your website. This section of the user manual details how a manual update can force the website to update immediately: