This has been a recurring demand from our esteemed organizers that they should get an option to customize the Welcome message and the Closed floor message as per their choice.
You can do so, by referring to your Floor Dashboard > Settings > Custom Message
Kindly refer to the GIF image below which will show you how it reflects on FLOOR login page:
Similarly, you can use the second option (Close Mode) to edit the message for the users who login while the Floor is on closed mode. It will reflect as highlighted below: