See if you are eligible and then apply

First of all, you need to do is give the GRE, get a good score in it and then apply. Because a good score will boost your application and increase your chances of selection.

For the free preparation of GRE, go to this site: https://www.qsleap.com

You can also join some paid classes too!

For registering yourself for the test, go to this site: https://www.ets.org/gre

Best of luck!

Hiii...

You need to find out first from which place you wish to complete your PhD. Look for the famous colleges of that place, check the eligibility criteria for the preferred colleges of that location, check for the annual fees of the college as well as the facilities. After completing this finalise the list of colleges which according to your research and interest is best for you. Checkout the details for the  application forms of those colleges. Fill the forms and contact the concerned college authorities and then they can guide you for further what all you need to do.