This is the existing core_navigation.tpl in teh core/templates folder
<li><a href="<?php echo url('/'); ?>">home</a></li>
<?php
if(!Auth::LoggedIn())
{
// Show these if they haven't logged in yet
?>
<li><a href="<?php echo url('/login'); ?>">Login</a></li>
<li><a href="<?php echo url('/registration'); ?>">Register</a></li>
<?php
}
else
{
// Show these items only if they are logged in
?>
<li><a href="<?php echo url('/profile'); ?>">Pilot Center</a></li>
<?php
}
?>
<li><a href="<?php echo url('/pilots'); ?>">Pilots</a></li>
<li><a href="<?php echo url('/acars') ?>">Live Map</a></li>
<?php echo $MODULE_NAV_INC;?>
<?php
if(Auth::LoggedIn())
{
if(PilotGroups::group_has_perm(Auth::$usergroups, ACCESS_ADMIN))
{
echo '<li><a href="'.fileurl('/admin').'">Admin Center</a></li>';
}
?>
<li><a href="<?php echo url('/logout'); ?>">Log Out</a></li>
<?php
}
?>
Just change it and add this,
<li><a href="<?php echo url('/'); ?>">home</a></li>
<?php
if(!Auth::LoggedIn())
{
// Show these if they haven't logged in yet
?>
<li><a href="<?php echo url('/login'); ?>">Login</a></li>
<li><a href="<?php echo url('/registration'); ?>">Register</a></li>
<?php
}
else
{
// Show these items only if they are logged in
?>
<li><a href="<?php echo url('/profile'); ?>">Pilot Center</a></li>
<?php
}
?>
<li><a href="<?php echo url('/pilots'); ?>">Pilots</a></li>
<li><a href="<?php echo url('/acars') ?>">Live Map</a></li>
<li><a href="<?php echo SITE_URL ?>/Watercooler">Forum</a></li>
<?php echo $MODULE_NAV_INC;?>
<?php
if(Auth::LoggedIn())
{
if(PilotGroups::group_has_perm(Auth::$usergroups, ACCESS_ADMIN))
{
echo '<li><a href="'.fileurl('/admin').'">Admin Center</a></li>';
}
?>
<li><a href="<?php echo url('/logout'); ?>">Log Out</a></li>
<?php
}
?>
So create a file in your active skins folder called core_navigation.tpl copy the above in to it and save. Your link should now be present and you can delete the page you created forum.