BuddyPress.org

I visited your site and I do not see title at top.

Depending on how your theme is setup you can do that by going into header.php file and check the class Id used than go in style.css and look the class and add
display:none;
than it will not display the title and description.
This is what i have in default twentyten theme
#header #site-title a{
color: #555555;
float: left;
font-size: 40px;
font-weight: bold;
margin-bottom: 20px;
text-shadow: 0 2px 1px #ffffff;
display:none;
}
#header #site-description{
float: right;
font-style: italic;
margin: 10px 0;
display:none;
}

Title and description are important for search engines.