How can I get my corners rounded

Try googling “css rounded borders”.

I already did that, the codes dont work

You need to use the CSS border-radius attribute.

^OK I just added that to the CSS and nothing happened

They do in all compliant browsers (IE is not classed as a compliant browser).

Try using Firefox.

I looked in Firefox & Chrome it doesnt work in either

I’m sorry but it works for me. I use it all the time.

#page-wrap {
	border-style: solid;
	border-top-width: 1px;
	border-right-width: 0px;
	border-bottom-width: 0px;
	border-left-width: 1px;
	border-color: #dedede;
        -moz-border-radius: 20px;
        -webkit-border-radius: 20px;
        -khtml-border-radius: 20px;
        border-radius: 20px;
}

That’s what I use. It works in everything except IE. Still trying to figure that one out.

it still doesnt work

You’re really not providing enough specific information for anyone to help you.

The CSS border-radius attribute works in general. Why you can’t get border-radius style definitions to apply to your specific site/Theme is something we can’t answer based on the information provided.