IP.Content is to add extra html (Php,css) content to your board, I'm not sure if you need that.
To add new shortcuts on top of your forum Look & Feel > Manage Skins > Manage Template & CSS (on the skin you want) > GlobalTemplate
Here, depending on your skin, there should be a code
<div id='primary_nav' class='clearfix'>
<ul class='ipsList_inline' id='community_app_menu'>
This is where all the top menus are starting, you should see a bunch of different things.
But below this
<if test="showhomeurl:|:$this->settings['home_url'] AND $this->settings['home_name']">
<li id='nav_home' class='left'><a href='{$this->settings['home_url']}' title='{$this->lang->words['homepage_title']}' rel="home">{$this->settings['home_name']}</a></li>
</if>
You can add something like
<li class='right'><a href='url_here'>Something</a>
</li>
It should give what you want i suppose.
If you have a dropdown menu like you said in your first post, you can add stuff to it by adding a the same code, but in the correct <ul>