I am trying to create a webpage using div, but I only have the header, left column, and footer positioned. When I try to create the right column, I am not able to position it where I would like to position it. My questiion is, how do I position other div elements inside a div container. As of now, I am using marin-left and margin-right.

What's the page you're having trouble with? Put it on a server somewhere and then we can see it.

Are you using floats?

if you are going for the header, content, sidebar footer set up you need to have a div container for each one.

With a basic structure like:

<div id="header">

</div>
<div id="sidebar">

</div>
<div id="content">

</div>
<div id="footer">

</div>

In your CSS you will need something similar to:

#sidebar {
float: right;
width: 200px;
}
#content {
 margin-right: 210px;
}
#footer {
 clear: both; // This makes the footer appear at the bottom of the page regardless of which column is longer.
}

In addition to those, I would put them ALL inside a "wrapper" div that is set to position:relative.