You can manage the links for properties, agents, agencies and developers from theme options:
You cannot use special characters like “&”. After changing the url you may need to wait for a few minutes until wordpress changes all the urls. If the links do not change after a few minutes, save again Permalinks and it should be instantly updated.
If the permalinks don’t update (or you get a page not found message) save permalinks manually
You cannot change the structure of the URL to include different elements. This just re-names the existing labels with your own.
Save permalinks when you are done.