print envelope with brother printer


I have a HHL2300D monochrome printer and I need to figure out how to print on the envelope. I have figured out how to feed the envelope but the print is noe printed on the center of the envelope. It is trying to print it like a page.
I figure I need some kind of program to do this but it did not mention it on the Brother site or any where else I checked. I have installed the tools and other software availible on the brother site but none of them shows how to do this.
Ideas always welcome. Number