why can't i authorize my computer?????

It sounds like you can't connect to the iTunes Store to authorize your computer. Have you checked out this troubleshooting article?

Hi this is a user group, not the customer support centre.

Have you discovered this Authorization FAQ which includes and email form you can use to contact customer support about your problem.
http://www.apple.com/support/itunes/store/authorization/

Sorry if im not doing this correctly but im totally new to it. Im trying to use multiple computers to add songs to my IPod i switched to manually manage music and videos but every time i try to add a song it says there is an unknow error -50 can someone please help?

Unknown error -50 is usually a firewall-related issue. If you're running Windows XP or Windows Vista, try the steps in this article:
http://docs.info.apple.com/article.html?artnum=302538

If you're on Windows Vista make sure you're on iTunes 7.1.1
(Help -- About iTunes)
There was an issue with Vista and earlier versions of iTunes 7 that would not allow you to authorize. It has since been patched, so this is an important update.

If you want to contact Apple's Support personnel you can find the appropriate number here:
http://www.apple.com/contact/
However, be advised that, like .Mac, there is currently no phone support for the iTunes Store. You may want to go here and send an e-mail support request to the iTunes Store. I did this myself recently and received an informative reply in less than 24 hours.
http://www.apple.com/support/itunes/store/

Hope you find this helpful
CG

Thank you but i did that and it did not work i still have the -50 error. Now is there another way to somehow use another computer to add songs on to my ipod?

i can shop and do everything else except have my computer authorized
If you can shop and purchase something, it is already authorized.

Have you actually plugged in the iPod and tried to put music onto it?

There is a way to use an iPod with multiple computers. See this page for more information:
http://docs.info.apple.com/article.html?artnum=61675

You could try clicking on Store and then Deauthorize computer until it says that this computer is not authorized. Once you get there, try authorizing again and see if you can get your songs on the iPod.

Apparently, logging into iTunes and purchasing a song does not mean your computer is authorized. I just deauthorized mine, tried to play a purchased item and received the message that my computer was not authorized. I logged in to iTunes and downloaded a song, successfully. I then attempted to play it, and, lo and behold, still getting the authorization message. I was, however, able to subsequently authorize the computer without any problems.

CG