Redirect advice

Hey folks! 

I added this forum script to my site:

http://www.phpcmsframework.com/2014/05/c...r-and.html

The issues I have with it is:
1. It comes with login/register but I have those already implemented..how do fix or redirect so that folks can easily go into forum when they are within the site(no second logging or registering)

2. I want to make myself and another person admin..how to give ourselves admin privileges not only for the forum but in general? I have 90% of the site done so is it too late to place admin privileges within the site?

If these are stupid questions I'm sorry..thank ya kindly

 ,
Mekaboo