Greetings! You will need to drill down a bit to find the subject lines for your automated emails. Let me jump in here and try to offer some orientation.
First login to your account and select the "Campaigns" tab from the top of the Emma interface. Then select "Automated" (see the screen grabs from my own account -- clicking on one of my images will open a larger version in a new window or tab).
Then look of the far right-hand side of the listings and select "Edit this mailing" from the drop-down menu.
When the editor opens, select "Review and Send" from the top.
You can access and edit your subject line from the next screen.
Save your changes, and remember to Publish when you are done to activate your changes within your Automated workflow. Hope this helps. Ted