You receive full access to your course as soon as you make the payment.
All you need to do is, after logging in to www.e-gmat.com, please click on the relevant button on the top right to navigate.
For example, to access the SC course, click on Verbal-> SC from the top right corner of your dashboard (click here for screenshot).
Similarly, if you purchased a Quant course, you can access the quant module of your choice by clicking on Quant on the top right corner of your dashboard and selecting the pertinent option from the dropdown.
For more information regarding how to start and plan your preparation, please visit the following page