Tasco telescope[46-114500]cannot see anything through lens.bought

You can get a manual on this web site:
http://www.tasco.com/pages/instruction-manuals/

This is a reflector style telescope. with mirrors-- probably on an equatorial mount which needs to be polar aligned in order to be used. Read this:
http://www.astronomy.net/articles/4/polaralign.html

Did you take the cover off the front lens?

All of Tasco's manuals are on this web site:

http://www.tasco.com/pages/instruction-manuals/

Put the eyepiece with the largest number written on it into the focuser. DO NOT use the 2x barlow if you have one. Go outside and try again.. The end with the focuser is the UP end of the tube. The mirror inside is the BOTTOM of the tube nearest the ground.

I answered your question in your other posting.

SEE this and look at the picture of the Dobsonian reflector. Notice the eyepiece and focuser is on the FRONT of the telescope. The mirror is the BOTTOM of the telescope.
http://www.texasastro.org/telescope.php

You mean your 2x or 3x barlow. These can be purchased from many on-line retailers:

Here are two:

http://www.telescope.com/control/category/~category_id=barlows

http://www.agenaastro.com/Barlow-Lens-1-25-inch-s/66.htm

http://www.scribd.com/doc/11827347/Tasco-Telescope-Manual

Loosen the set screw and it pulls off.

Look through the tube with the eyepiece out, and lens cap off. You should see light coming in. Then use the lowest power eyepiece to start. You can use it on ground objects initially until you get a hand on it. Many make the mistake of going directly to the highest power, and get off the track as the field of view is tiny, and objects are dim.

It is very difficult to align a straight telescope on small objects like stars and planets. The moon is an easy target, try locating it 1st