adding widget code to side

Hey everybody,

Need some help…somewhat new at the WP world but I’m slowly getting the hang od it.
I have a feed that I want to display on my site. Right now my layout has one main side area and a left & right side bar left sidebar. I’d like to know what code I need to use to place the feed on the main or upper sidebar area where there is more space.

Any help is appreciated greatly,
Roni