Customize jitsi

I am studying web development and my task is to install jitsi on an ubuntu server, I already achieved that point.

Second task is to edit as much as possible the Jitsi interface, guest links, delete messages when creating conferences from the go button

I have been studying for 4 months and I do not understand much and the worst is that they are online class due to the pandemic

somebody help me

pre-meeting screen

Yes how edit the screen that is shown when sending or sharing the inivtado link on an android cell phone?