Help with simple PHP problem

I’m trying to insert a link into the write page on geocoder, so that my users can get coordinates for their address more easily. I thought it would be simple, but I can’t seem to figure it out. Sadly, my PHP knowledge is extremely basic. If anyone can help me, I would really appreciate it.

Here’s the code:

//* Displays the Geo interface on the post editing form
*
* Long description for the Function.
*
* @param $content Description
*/
{
global $post_ID;

$geolocations = get_settings(‘geo_locations’);

$output = ‘<fieldset id=”postexcerpt” class=”dbx-box”><h3 class=”dbx-handle”>’ . __(‘Location’, ‘Geo’) . ‘</h3><div class=”dbx-content”>’;

list($lat, $lon) = split(‘,’, get_post_meta($post_ID, ‘_geo_location’, true));
$output .= ‘<label for=”geo_lat”>’ . __(‘Latitude:’, ‘Geo’) . ‘ <input size=”10″ type=”text” value=”‘ . $lat .'” name=”geo_lat” id=”geo_lat” /></label>   ‘;
$output .= ‘<label for=”geo_lon”>’ . __(‘Longitude:’, ‘Geo’) . ‘ <input size=”10″ type=”text” value=”‘ . $lon .'” name=”geo_lon” id=”geo_lon” /></label>   ‘;

$output .= ‘<label for=”geo_select”>’ . __(‘Preset:’, ‘Geo’) . ‘ <select id=”geo_select” onchange=”geo_choosegeo(this);”><option value=””>–choose one–</option>’;
foreach($geolocations as $geolocation => $coords)
{
$output .= “<option value=\”$coords\””;
if($coords == “{$lat},{$lon}”) $output .= ‘ selected=”selected”‘;
$output .= “>{$geolocation}</option>\n”;
}
$output .= ‘</select></label>’;
$output .= ‘</div></fieldset>’;
$content .= ‘<div>’;
echo ‘Lookup latitude and longitude for your address.‘;
$content .= ‘</div>’;

return preg_replace(‘#(<div.*?id=”advancedstuff”.*?’.’>)#ims’, ‘\\1’ . $output, $content, 1);
}

function admin_head($not_used)
//

all I want to do is add a link to geocoder.us next to the left most box, with the text “find your coordinates”. I figured echo and some html would do it, but no luck.

Thanks in advance for your time.

Best,
Ben