I think doing a Chi-Test can be pretty tricky if you donīt know statistics.
There are calculators that can do this, and software, but you still need to know how to input the data etc.
This was something I found, it might help you.
There are plenty of resources online.
The Chi-Test is used to check wheter data contradicts the choice of a specific distribution function.
Other tests, like a deviance test, is often used for checking if different data are simply variance, or if some data actually have a different underlying distribution, or at least other parameters in the distribution function.