A) Learn patience, not everyone is on at the same time. If you expect instant results you'll get nowhere in programming.
B) Click the media tab to the right of the screen in DBP. Load your box, make sure it is in the Project folder. Then in the command window type Load Object "yourmodel.x", 1. You made need to move or scale the object to see it.
C) The Newbie Corner has this and other useful information, try it out to see if your question has already been asked and possible answered.
Teenage Male Geek + Female Remotly Intersted in Common Geek Activities = Teenage Male Jackass