Is there a subject line for the 3G slide?

Hey my fellow people, I need help with my 3g slide. I just added twitpics onto my phone, and I'm not sure how to use it. I have the concept and everything, I just don't know where to write the caption for the twitter picture because there's no SUBJECT line for the messages when you're sending a picture. Can someone help a brother out. Haha, thanks guys.