Issue with php file header control

[allnet]

Just trying to hide Godaddy Banner on Free Hosting account so I can demo the site for someone, any idea on which php file to insert function or css so this can be accomplished? temporarily of course. I've tried inserting the following in various files but none seems to work so far:

<style>
#conash3D0
{
display:none;
}
</style>

and/or


function godaddy_style(){
?>
<style type="text/css">
#conash3D0
{
display:none;
}
</style>
<?php
}

add_action('header','godaddy_style');
add_action('footer','godaddy_style');

Suggestions?