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Do not know where you live but humidity will fog the eyepiece. Put the scope out with the covers on for at least one hour to reach thermal equilibrium. Use the lowest power (highest number) eyepiece first.
I going to straight forward on this answer. This telescope is a useless piece of junk! The tripod is unstable, the .965 (obsolete size and design) eyepieces will only focus dead center. The finder is useless, too narrow a field to find anything. The high power eyepiece exceeds the maximum useful magnification (only 98x max under perfect conditions) This may be used for terrestrial viewing but worthless for astronomy.
Take the scope outside during the day time. Remove the lens cap-- put the diagonal into the focuser at the rear of the scope. Put the eyepiece with the largest number written on it into the diagonal. DO NOT use the 2x barlow-- practice focusing on a distant object during the day time.
It is common for binoculars to have one independently focusable eyepiece. If one eyepiece can be rotated, then that is the case.
If that is the case, focus through the one that DOES NOT rotate using the center control until you get a sharp image on that side. Then rotate the eyepiece on the blurry side until the blurry side is sharp. If you succeed at this, from henceforth the center control will focus both eyes adequately
You don't need to get Vivitar brand eyepieces to get additional 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".