Add video to the Waiting room for webinars

Hi!

I want to add a video in my waitingroom for webinars so the participants can see a welcoming picture of us in our webinars, with just "hi, the webinar is just about to begin - you can find us here, here and here". I've found a tutorial on this, but in my view on Zoom it doesn't look like that. Do I have the wrong payment-plan, or is it the website that don't have Zoom 5.7.3 that is the problem? We have a paid account and mostly all the features in Zoom already. 

https://chrismenardtraining.com/post/zoom-add-video-waiting-room