please teach me how to design a room change its mode...thank you...

Very easy. When you acceed to the Multiplayer Page, click on the Create Button located at the bottom-right hand corner of your Toribash screen, and then, name it. You can find a tutorial here : COMMANDS

Also, this thread belongs in Support, and might already have been answered. Don't forget to use the search button.

i am sorry i am new i could not find it thak you very much for your help my friend

by the looks of it you won't have trouble around here if you keep that attitude .
If you need anything feel free to ask me.