Please note that you may only edit Press Releases in Pending Status. Please see the attached image to aid you. If it has been approved or sent then you will not see the option to edit your press release.
You may edit/add media outlets to a Press Release that is still in "Pending Status" by logging in and clicking "My Profile" in the top right corner. Once in your profile select the "Mt Press Releases" tab.
Locate the item you wish to alter and click "Edit." Select the box titled as "Check here to edit your pending press release" and hit "Save". Make the necessary changes to your submission and click "Save" once again. That's it!