If you need to add a contact to an existing listing, simply add the contact by doing the following: 

Open the listing by going to the list of properties in your database, or

call it up by searching for its reference number

The mandate window will open

Click on the "contact" icon on the right-hand side of the open window

Click on "Add new contact" or Link existing contact it the person is already loaded onto the system

Fill in the required fields making sure to link the contact type e.g. Seller/Tenant etc.

Save the changes