How do I change URL

Hello,

I have installed wordpress blog on http://www.example1.com/wordpress/ and i have set another domain using domain forwarding like http://www.example2.com. So, once user click on http://www.example2.com so, this url will see my blog here which i have uploaded on this (www.example1.com/wordpress/) without url change.

My Question start now.

Once i open the blog http://www.example2.com then i can see the logo link http://www.example1.com/wordpress/. So, I want to change it to http://www.www.example2.com. Can you Please let me know how can i change the url from admin?

Thanks,