Google Adsense

I got the web based WordPress with my own domain, and today I’ve been trying to put the Adsense code into the Text Widget, with no luck. It doesn’t work.

I have tryed using both Google Scripts Syncronous and Asýncronous. I have tried changing the WordPress Theme. I have tried just about everything, but it doesn’t work.

It looks as if I need some kind of a plugin for the Web Based WordPress?

If I am getting this problem, I suppose that it will be happening with other users a lot.

Can someone please help me? Thanks