Hello aspirant

To register for GRE exam, you have to first create an ETS account. Then you have to verify your mail, choose test centers, select your test appointment which is comfortable to you, then you have to select the test date, then register for the test, then at last follow the directions to continue for your registration.

To register or to create ETS account, you can refer this link- https://www.ets.org/gre/revised_general/register/how/