Asanta, I went to the website and looked over their stuff. I’m actually quite impressed with what they have accomplished for $20. And I’m VERY impressed with the unconventional split-tube design—that really shows people how a telescope works!
The problem you’re facing is that the Barlow lens that you use to get 50X extends the focal point of the objective further back. So the first question is, are you going in the right direction? Are you trying to get a focus by moving in or out? The focus should be further out than the normal focal point. How far back can you go?
The next question may sound silly, but it really does matter: are you sure that you got all the lenses facing in the correction directions? It really does matter if the lens is backwards. Also, make absolutely certain that you build the system properly. For example, the Barlow lens is a two-part lens; if you left out one of the two lenses, you can’t get a focus.
Next, I want to advise you that more magnification isn’t all it’s cracked up to be. With more magnification, the image shakes more violently from tiny movements. The image is dimmer and not as clear as at lower magnification. I have a big 8” Celestron, and I always use it at the lowest possible power—about 40X for this telescope, which is mounted on a very stable mount and has excellent optics. Only rarely do I take it up to higher magnification, and even then the highest magnification I use is about 120X.