Every time I load the game up, it freezes and send me back to my "desktop."
You'll need to contact the publisher of the iPod Touch version, iPhSoft (http://iphsoft.com), directly for technical support. There is an email link at the bottom of their Inherit the Earth page (http://iphsoft.com/ite.html).
There are quite a number of possibilities as well that it doesn't work on your iPod touch. In fact, have you tried it on another iPod touch? You could always sort things out first, like having your friend install on their iPod touch. In fact, it is not all the time that the game has something to do with the freeze, maybe it is just your iPod touch's version doesn't match and you need to have a firmware upgrade, etc.