1) One hour prior to your schedule meeting, both parties will receive an email reminding them of the pending meeting. Make sure you are logged in and in Ready Mode. If you don't know what that is go here to learn more.
2) At the appointment time you then click on the Calendar icon and your list of Scheduled Calls will appear. If you are the Requestor and the other party is already logged in you can click on Talk to Expert. If they are not logged in you will not see this option so you can Message them that you are ready. Once they are logged in your can start the video call.