Actions ATM7021A CPU OS is Android 4.2.2 (Jelly Bean. thanks
Looks bad ... can't find any rooting guide for your device.
You can post your question here: General discussion > Upgrading, Modifying and Unlocking.
Here is a general quide to rooting: (INTRODUCTION TO ROOTING) New to rooting/flashing ANY Android? See this guide!
There is a list of common rooting methods ... maybe one of them also works for your device.
And I found this generic rooting article on xda: How to Root Any Device ... with links to the device specific forums and to the most common rooting threads.