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Put the eyepiece with the largest number written on it into the focuser. I believe you have a REFLECTOR style telescope with a 3.5 inch mirror in the bottom.
Point the focuser end toward a distant object and practice focusing during the day time.
Later you can try the higher power eyepieces with the SMALLER numbers written on them. I belive one of the long pieces is a finder scope that mounts on top. AND the other is a 2x barlow which multiplies the eyepiece power by a factor of 2 times. Don't use the barlow. You will not need it.
The image will be upside down, which is normal for an astronomical telescope.
There are only two types of telescopes --- REFRACTORS, and REFLECTORS-
The refractor has a lens on the front of the tube and you insert different eyepieces in the back-- the larger the number written on the eyepiece the LOWER the magnification-- (DO NOT USE THE 2x or 3x barlow which you may have!-- this creates too much power for this small telescope!-- put it away and never use it!)
A reflector has a main mirror on the bottom of the tube, and a small secondary mirror under the eyepiece hole (focuser end) - front end-- put the lowest power eyepiece into the focuser.
Now with either type telescope go out side during the day and practice focusing on a distant object-- turn the knob SLOWLY. At night the moon should be the first target you try.
If you received what appears to be a smaller telescope -- that is the finder scope-- attach it to the top of the tube on the main telescope. Again during the day line up the small finder scope with the main scope-- look at a distant telephone pole (the very top-- and center this in the main telescope. Without moving the main scope use the finder scopes "screws" to adjust the cross hairs so they are pointing exactly where the main scope is pointed. Now you can use the small finder scope to point the telescope in the exact direction--
The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky. So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.
What eyepieces sizes have you used? Try using the largest eyepieces you have (20mm, 25mm or higher) for a wide field of view. If your eyepiece is to small (maybe 15mm or below) you will have too much magnification and the moon will be a blur.