SETTING UP A STAGING AREA FOR MY WEBSITE - URGENT HELP!

Hi guys,

HELP!
My new site has just been migrated to my own host but it's not yet finished so I asked that it be put into a staging area so I could work on it further (I also posted here looking for someone to help me do this).

BUT it's not ben done so it's now live ;(((

Can anyone tell me what I need to do to change it so no-one can SEE it.

I will also need to put a placeholder page in place so anyone who finds it will be advised it's coming soon.

My host is Crazy Domains in Australia