Help displaying Total Members

[mariohn]

I am having dificulties displaying a few variables on my forums. I want to display the total number of members, thread, post, and number of people online on a side bar of my forums, whenever i use the variables it doesn't work. Here is what i am using

<li>Forum Members: <strong>$numbermembers</strong></li>
<li>Total Threads: <strong>$totalthreads</strong></li>
<li>Total Posts: <strong>$totalposts</strong></li>