There are three ways you can apply a tag to a property:
Tags can be applied as you are creating a new property through the property wizard. The Details section on first screen of the property wizard contains a tags field. Enter one or more letters to view any matching existing tags. If the tag you are after doesn't exist, continue typing to create and apply a new tag.
Once the property is created, the applied tags are visible on the Properties screen.
Import a Property
When importing a new property, a column has been included to add tags to each property. Enter all tags for each property in the Tags column, separating each tag with a comma.
Tags can also be applied or removed to existing properties from the Property Details screen.