Have you thought about other video editing/creation apps? I ask because it appears as if the only way you can add text to a video created with Animoto
is to access the web site. That's where the rendering is done - then you get the video back.
But, there are other creative apps that do rendering on the iPad itself. Two come to my mind right away:
ReelDirector ($1.99, USD) and
iMovie ($4.99, USD). Now, I see that ReelDirector explicitly states you can add text before rendering, while I can't tell if iMovie does.
Now, I am unsure about getting it off the iPad. iMovie says it'll save videos to the Photo app and provide for direct uploads to YouTube. ReelDirector says it also allows for uploads to YouTube - but mentions nothing about saving to the Photo app.
Disclaimer: I have ReelDirector, though I've not really worked with it. I don't have iMovie...
Just maybe - it might be easier to actually create the video in it's entirety on the iPad? Maybe these other apps may suit better?
In other words, I don't have an answer to your specific question. Sorry.
Marilyn