Do you know how to remove that message that they use to get people to download their app? It should go to web browser automatically.

Jitsi works in PC web browser and mobile App. You need to find someone that will get you a private server and they can remove the Jitsi watermark and customize it for you. Without a private server it's almost impossible to remove for mobile web browser. 

You make a great point though. If UNA wants to use Jitsi as it's messenger model now and in the future they should make an alternative mod that has several paid layers. Paid option 1 would be a basic watermark removal and private server setup and 2 would have all of Paid option 1 but also include more basic customization work like template, colors, fonts, etc.