1. Login as User (Landlord) .
2. Navigate to Menu(On left side)--List/Properties page.
3. Add a property by clicking "Add property".
4. Add a List by clicking "Add listing".
5. Navigate to Review Tab After Adding data in property -->Rental Details-->Amenities-->Schedule and Gallery tab. 
6. Toggle Partner Search Engine . default toggle is ‘No’. A validation message will trigger saying message “Please upgrade your plan going to Settings ?Subscription".
7. This will Publish your property listing on 3rd party portals such as; Zoopla, Prime location, Rightmove , Gumtree etc.
Note:
This is available to only upgraded plan