This article refers South Australian legislation: The legal entity (agent or agency) whose name appears on the sales agency agreement must have their RLA (license registration number) on every property advertisement for sale.
For example: John Smith 0456 785 393 Smith Real Estate 8445 3334 RLA 1234
Please (ref Land Agents Act sec 48A)
Add RLA to Website
Add your RLA number on every page by adding a menu option to the footer menu, enter your RLA number as the text and make it a category rather than a link.

Tips on how to add a menu item found here.