[Dismounted]

Firstly, a constructor method is "__construct()". Secondly, "$this" refers to the current object, not another object. Thirdly, you actually need to populate your variables.

PHP Code:

class League
{
    private $vbulletin;

    public function __construct($vbulletin)
    {
        $this->vbulletin = $vbulletin;
    }

    public function showNews() 
    {
        echo $this->vbulletin->userinfo['username']; 
    }
}