If you have not yet filed here is how to add a dependent. If you have already filed you will need to amend your taxes.
Click My
Info on the left panel. You should
be at the page that has all your personal information. Click Add a dependent. Let me know if you need more help.
**If you have file WAIT until you receive your refund and then
Amend.
Follow these
instructions to amend :https://ttlc.intuit.com/replies/3288565