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This type of telescope is viewed from the small tube at the rear. Use the longest lens you have. Most people think that they need magnification, but that is not accurate. A 5 mm lens will only have 1/6th the field of view (how much sky you see) compared to a 30 mm. The picture below was taken through a 50 mm lens.
The direction of light can be changed in 2 ways. One way is refraction which is usually done by a lens (eyeglasses do this). The other is reflection, most often done by a mirror. Telescopes are almost always based on reflection and/or refraction designs. A reflective telescope has at least one curved mirror, often 2 curved mirrors which focus light by reflecting a larger area of natural light on a smaller spot.
If your telescope is a reflecting telescope then the problem might be with the mirror alignment - the process is called collimation. There is an entire process on how to do this (Google Collimation Reflecting Telescope).
If you scope is a refractor then maybe you forgot to remove the lens cap. Check it out. Sometimes it is as simple as that.
Without further information and pictures, we cannot help too much.
As we all learned in grade school, telescopes produce an upside down image - it's okay for astronomical use since upside down doesn't matter. If you want an image like you'd see in a pair of binoculars, get an image erector from a telescope accessory store to add to your eyepiece.