What Tasco do you own is it a refractor or reflector? Does it have a lens in front -- then it's a refractor; or mirrors, then it's a reflector.
On a refractor the eyepieces go in the back of the tube, sometimes you also have a diagonal which goes into the scope first and then the eyepiece goes into the diagonal. The diagonal is simply an L shaped device with a mirror inside that makes it easier to look through the scope when it is pointed UP at an angle.
On a reflector the focuser is on the FRONT side of the tube, and the eyepiece goes into the focuser.
Take the scope outside during the day time and practice focusing on a distant object. Put the eyepiece with the largest number written on it into the focuser or into the diagonal. This is your LOWEST magnification.
Practice focusing --- until you get used to how it is done. Turn the focuser knob to the left slowly-- if nothing comes to focus then try turning it to the right. It may take several full turns to come to focus.
At night the moon should be your first target.
Read my TIPS on my profile page.
ABOUT NOT FITTING: eyepieces come in 3 sizes, .975, 1.25, and 2 inch sizes. Measure the hole and then measure the eyepiece-- it may be that you have the wrong size eyepieces for that scope. The correct size can be purchased on line from many retailers. Here is one telescope retailer that sells eyepieces and other accessories:
http://www.agenaastro.com/
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