Now, If you really are determined to remove the app, you first will need to root your phone, then you will have access to the system partition. Given that this is a fairly old model that shouldn't be a problem.
However, there are things to consider. First, rooting your phone (properly -- not with one of those one-click root hacks) will most likely trigger a factory reset, so you'll need to reinstall your apps and restore your backed-up data (you are backing up, right?
) Second, if the app you want to uninstall provides any shared processes with other apps, then you will also disable that functionality on apps you may wish to keep. Finally, if you choose at some point you need that app back, it won't be as easy as simply reinstalling it in the system partition. You'll need to reflash the original firmware.
And, even after you've gone all through that, you still won't gain any space. Can I ask why you want it removed?