Setting up an account on Trulia is very simple and straightforward.
My suggestion is to sit down with him and have a frank discussion about what his marketing plan includes.
The goal would be the agreement that he will actively market your home - to incorporate all possible venues: Trulia, craigslist, FB Marketplace, Realtor.com, blogging... and more.... Most of these options are FREE.
In summary, all sellers need to stay on top of the Internet presence their Realtor is utilizing...... you will have to make a decision if your agent is willing to get on board with the changing trends in the marketplace i.e. Internet.