Yes, you can post a rental listing here since you are registered on the Trulia site as a "landlord".
Click on the "Rent" tab on the banner at the top of the screen. A drop-down menu will appear with a tab "Free List a Property". Here is where you can add the details of your rental listing.
Feel free to contact Trulia if you experience any problems at: www.trulia.com/help/ask or call them at 888-466-3501 M-F from 7:00am-4:00pm PST.
Prudential Connecticut Realty