AME2020 is going to use the conference app WHOVA. Once you have registered for the conference you will be granted access to the online conference through WHOVA. With WHOVA, you will be able to watch live-streamed invited addresses and symposia; you will have access to all pre-recorded paper presentations and posters; you will be able to meet and chat with presenters and connect with all other attendees of the conferences. Attendees may either use the mobile app on their smartphone or the WHOVA web app on their desktop computer.
For further instructions how to download and use WHOVA check out this tutorial, or watch this youtube video.