[Q] Please help funtab pro topic

I have a funtab pro.It has a Kernel version 3.0.8 root@ubuntu#162 with a android version 4.0.4. It has ice cream sandwich.I would like to put kit kat or jelly bean.I play some games and surf that net.I would change wifi singal to pick a better signal.I would google play store on it.I am new at this stuff.But everytime i try something i get that stuid msg unfonturly something stop.Besides throwing out the window.I like to do something with it.Remember go into detail i am new at this.THANK YOU FOR YOUR TIME.