How to add in Jitsi Meet meeting new buttons

Hello there. I’m a student, which doing a diploma in college about jitsi meet. I’m creating this kind of private server for a company. I wanted to ask you, can you please help me? I want to make some usefull functions. How to make something like below in Jitsi Meet?
My jitsi meet instance is being installed by this arcticle : How To Install Jitsi Meet on Ubuntu 20.04 | DigitalOcean


I’m new in jitsi in my country, and i don’t know how to do these functions. Can you help me please? Waitng for your reply

My Jitsi Meet instance is basic, how to integrate those buttons, where i attached earlier? You don’t know @damencho ?