cotyweaver on "Won't let me publish my site to the web.."

I' completely new to this, but I haven't been able to publish my site to the net. I made the site somewhat presentable and when I hit the publish button, all I got was the 404 error. I talked to the hosting support and they at least got a picture to appear. This time I made the site look better, and it keeps showing the old stuff, if anything at all. I know this may be an easy fix, but, I haven't done anything like this since Myspace in '09.

Also, I'd like to know how to get the white box and "Welcome" off the front page, all I want is the picture. Is there a way I can set up folders that require a password to open?

Thanks in advance for your patience and help!