Rounded Corners

Hi, I was wondering how I can have round corners, on all the sharp edges of my forum, just like this forum? 
Here is the link. http://bearvilledaily.niceboard.com/
I have tried many different rounded corner codes, however none are working.

Code:

#wrap , .forabg , .forumbg , .post{
border-radius:5px;
-moz-border-radius:5px;
-webkit-border-radius:5px;
}

Just add that in your CSS Stylesheet ( Administration Panel -> Display -> Colors -> CSS Styesheet )

Not working, I added the whole code in the CSS stylesheet.

Code:

#wrap {
border-radius:5px;
-moz-border-radius:5px;
-webkit-border-radius:5px;
}

.forabg {
border-radius:5px;
-moz-border-radius:5px;
-webkit-border-radius:5px;
}

.forumbg {
border-radius:5px;
-moz-border-radius:5px;
-webkit-border-radius:5px;
}

 .post{
border-radius:5px;
-moz-border-radius:5px;
-webkit-border-radius:5px;
}

Try now.

It made the corner on forum categories rounded, however the corners on the widgets still have sharp edges.

Try this for the widgets:

Code:

.module {
border-radius:5px;
-moz-border-radius:5px;
-webkit-border-radius:5px;
}