Try adding this repository: www. ijailbreak .com /repository/ (NOTE: Remove the spaces - I didn't want a link cause you'll need to type this in)
That's where I found an iPad-compatible version of Mobile Terminal. I've used the one from there (successfully), so I'm pretty sure it'll work for you (I have iPad 4.2.1 with GreenPois0n jailbreak RC6.1).
And, if I remember correctly, if you go to that web site, you'll find instructions on how to use Mobile Terminal to change your password (if that's what you want it for...).
Good luck.
Marilyn