MyBB Community Forums

I'm gona re-design my forum , but i wanna set an index for my forum so others to show that we're under construction and i can design my forum without showing index for me , only for others  ? 

you can turn off your forum - set it offline through forum settings
admin panel >> configuration >> settings >> Board Online / Offline >> Board Closed --> yes

Yes, but i don't wanna show my forum totally, i just wanna hide it , i know offline method by Board On/Offline.
But it exist any way to do via index ?

^ along with that you can put a index.html / construction.html page and divert others to it through .htaccess (eg.)

Thread can be closed .
I solved this problem by creating new index renaming comingsoon.html and then went to .htaccess to my root
and added there in the top some texts and now it's fine ,
Thanks you also .m.