LisaCWolfe on "404 error"

My site has a 404 error. It is Wolfestrong.com; I was accessing it with Wolfestrong.com/w and had genesis installed; was making a lot of progress until I tried to figure out how to get rid of the "under construction" page that my old webmaster put up.
I tried to first change it by removing the /w; it seemed fine but now I can't get into the administrator panel or anything at all.
Help!