Its hard to root anything without a computer. there are apps that say they can root without a computer but not sure which would work best for you.
the best thing i advise i can give is to research (if you can) google, youtube, or even the XDA forums to see if anyone has found one that has worked for them.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?