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First are you sure you have the CORRECT end of the scope pointed toward the sky? On a reflector type telescope that uses mirrors, the focuser is on the side of the tube on the UP end of the telescope. The mirror is in the bottom.
Mose caps simply pop off, others unscrew. You may be trying to remove the BOTTOM mirror!
It depends if it is a REFLECTOR or a REFRACTOR style telescope. You never said what you own??
On a reflector the focuser is on the front end of the telescope on the side of the tube. The eyepiece goes into the focuser.
On a refractor style telescope the focuser is on the small end of the tube, the main lens is on the UP side pointed toward the sky. The eyepiece goes into the focuser on the backend of the telescope. Sometimes you will have a "diagonal" which goes into the focuser first and then the eyepiece goes into the diagonal. The diagonal makes it easier to look through the scope when it is pointed UP high into the sky.
See my TIPS on my profile page and read this web site:
If there is nothing on the objective lenses or eyepiece lenses then it most likely needs collimation. This is where you adjust the secondary mirror while viewing an out of focus star. You need stable sky conditions to do this.
There are most likely three small screws at the front of the telescope and these are what you use to adjust it. As one screw is loosened then another is tightened. Do this in very small increments. If you have your manual it should outline how to perform this. If not go to this web site: http://www.astrosurf.com/legault/collim.html. It will show examples of how objects look both in and out of collimation. There is a section further down the page for SCTs.
A very handy tool for this is to replace your screws with Bob's Knobs (http://www.bobsknobs.com/) . These replace the screws and allow you to adjust it by hand instead of a screwdriver.
The other focusing problem I've experience with my Celestron SCT is to have the focus knob loosen up and then slip as I turned it so that I could never focus with it.
You don't need to get Vivitar brand eyepieces to get replacement ones for your telescope. I'm not sure of the specifications for this particular telescope but in general they come in two barrel sizes for the eyepieces. The diameter of your eyepiece is probably 0.965" but could come in the more standard 1.25". You can measure the diameter and determine this quickly.
Once you know the diameter to shop for you can look for the focal length of the eyepiece you wish to purchase. They are rated such as 4mm, 10mm, 25mm, etc. The smaller numbers give you higher magnification. You can calculate the magnification by dividing the telescopes focal length by the eyepiece focal length. For example, let's say your telescope is has a focal length of 360mm and you have an eyepiece rated 10mm. Divide 360 by 10 and that gives you a magnification power of 36.
You can find eyepieces at many telescope dealers on the internet. Your selection will be far less if you use 0.965" eyepieces. You can purchase 0.965" to 1.25" adapters so that you can use the larger eyepieces with your telescope. However, on some telescopes the adapters will cause the new eyepiece to not come into focus.
You'll also find that eyepiece prices go all over the place. A good general purpose eyepiece is a type called the Plossl. The better eyepieces have more coatings too that allow more light to get through to your eye. You'll find these listed with terms like "fully multi-coated".