How do I stop the description of the forum from showing on the index, but keep it in the background for search engine purposes ?

What you are talking about?

Also, how do I stop my logo from disappearing when someone mouses over it ??

It's a rule in the CSS-File (style.css). The -66px-rule slides the image away.

#logo h1 a:hover {
    background: url("images/my_little_forum_logo.png") no-repeat scroll 0 -66px rgba(0, 0, 0, 0);
    color: #FC0082;
    text-decoration: none;
}

Seems to be your own rule.

Tschö, Auge