First of all, in order to use Snapchat, you need an Android smartphone or tablet.
If you got that, go here, download and install Snapchat.
After you install it, create an account, you need an e-mail address, a username and a password.
After that, start Snapchat, swipe to the right. You will see “stories” on top and a search icon. Click on the search icon and type “therealathene”. You will see a result with a plus icon on the right side. Click on it and now wait so Athene will accept you on his friends list. After that, his account will appear in the “stories” tab. If you press and hold on his name, you will see his videos :).
So basically, what snapchat is, you will see some small videos.