Go to Advanced > Customization Scripts.
Copy and paste the following script in the JS customization field and click on Save:
$(function(){
$('div.pull-right').prepend('<a href="/event-attendees" class="btn btn-md btn-color3 m-b-sm m-t-sm makefull"><i class="fa fa-user" aria-hidden="true"></i> Attendees List</a>');
});
3. Ask for approval of your script in the chat (normally approved within 5 mins)
4. Click on Preview to view the result. It should look like this:
Notes:
The session hosts will not be displayed to protect them from excessive connect requests.