Did you refer your agent to the listings or broker help pages? What was to be included in your marketing? Are you being represented by a full service broker? If you have a limited service listing, it might not be included.
Have you asked your REALTOR if they have attempted to put your home on Trulia? If the answer is yes, then I would say give it a couple more days for the data to be uploaded to Trulia. If your agent says he has not attempted to do it, then it's time to have a different dialog all together with your agent. The more exposure your home gets the quicker you'll find the right buyer. Your agent should be more than willing to help you sell your home!
I'm also a Realtor, and there does seem to be a lag time between activation of the MLS feed and Trulia posting it. Perhaps they don't update their feed often enough. We activated the feed to Trulia last week and still none of our listings have shown up. I emailed Trulia about this and am awaiting a response.
Don't know if you can do it or not. The real question is why hasn't your agent done it for you when you specifically asked him to do it??? Realtors are here to service our clients. I would ask your agent to do it again.