[otrs] How to use the [ Customer Company ] feature

Hi! I'm on OTRS 2.4.3 but I don't seem to figure out how to put users into a 'company' that I have created under the '[ Customer Company ]' link on the '[ Admin-Area ]' page. If you need to change the 'CustomerID: *' on the '[Customer User Management ]' without a drop-down or anything else, then I don't see the point. What am I missing? Are there any config I need to enable to have this work? Are there any other information I need to give you to help me out here? Or do I have to do the DB thingy mentioned in the manual? It did not seem related to this issue as I see it... Hope you can help me here! -- Stein Erik