Welcome to Trulia and thank you for your question!
You can edit listings that you've submitted to Trulia manually in the My Listings section of your account. You can navigate there via the My Trulia link at the top of the page or directly via the link below. You'll find an option to 'Update details' associated with those listings you've submitted
Please note however that if you didn't submit a listing to us manually, you won't see the option to edit it, and in that case you'll need to contact the source providing us with the listing information to make any updates.
Please let us know if you have any other questions.