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This is a reflector style scope with a large mirror in the bottom, and a small secondary mirror underneath the focuser. The focuser is on the UP end of the tube as the picture shows in your question.
Simply insert the eye[pieces into the hole on the focuser and turn the knob left or right until the image comes to focus. Practice during the day time on a distant object starting with the eyepiece with the largest number written on it.
Read this-- http://texasastro.org/telescope.php about the types of telescopes.
Objects in the night sky are tiny and many of them are very dim-- the scope must be pointed directly at them or you will not see anything.
Find a local Astronomy club and the members will help you. All of Bushnell's manuals are located on this web site: http://www.opticsplanet.net/bushnell-warranty.html
Why would you need a manual for a simple Dobsonian reflector telescope.
The Company does not exist-- anymore.
A manual only showed how to assemble the telescope, it DOES NOT tell you how to USE the telescope to find objects in the sky.
This is a good beginner telescope by the way. Here is how to get started using it:
1. During the day time align the small finder scope and the big scope on the same distant target. Then you can use the finder scope to locate and POINT the main tube to objects in the night sky.
Also during the day put the eyepiece with the largest number written on it into the focuser. This is your LOWEST magnification. Practice focusing on a distant object. The image will be upside down--- this is perfectly normal. Nothing is wrong with the scope.
The moon should be the first target at night.
Buy two books: Turn Left at Orion and Nightwatch.
Download the free monthly star charts at: http://skymaps.com/downloads.html
You can watch there videos to learn about Astronomy for beginners--