Do you need to adapt the welcome text that the user sees when entering the room?
It's easy to do: https://docs.bigbluebutton.org/2.2/customize.html
The parameters for this are defaultWelcomeMessage and defaultWelcomeMessageFooter in the file /usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties.
defaultWelcomeMessage = <default welcome message>
defaultWelcomeMessageFooter = <default welcome message footer>
Just send us your desired texts and we will be happy to change them for you.