Put up banners?

You'll have to click around the various buildings around your campus to find the sports arena; you'll know which one it is bc you'll have the option to attend sporting games there and to put up banners on it. I don't have DU so I can't give you exact directions, but hopefully this should suffice you. :)

Thanks guys! Found the buildings now and it worked. o:)

There's at least one stadium in each uni that I have seen. Just click on the buildings around the center of the campus. There'll be an option to put up your banners on the ones you need.