Sometimes as was the case at my school, traditionally BGLO's are not recognized on their respective campuses because they don't have charters there (why, I don't know, but that is a whole different story). However, they may have members who attend your school but join through a nearby university. I would suggest that you go to Student Life or the Office of Black Student Services (or whatever it may be called on your campus) I am sure that someone there will be able to help you!