Edit Logo Image:
In your jitsi-meet deployment, probably in /usr/share/jitsi-meet/images the image file will exist that you can override with your own.
Update Link on Logo:
You can edit: Path: /usr/share/jitsi-meet File: interface_config.js Parameter: JITSI_WATERMARK_LINK: or SHOW_WATERMARK_FOR_GUESTS: false
Change texts of Welcome/Home Page:
From your terminal type
as a root or sudo user. Search for the content you want to replace.
You can just search for “Secure, fully” you will see it with other content as on the screen. You do the same thing to change description in the same file by searching for something like “Go ahead” you will see other text.
Made your modification, save and preview in browser.