DNS set up by using yahoo small business

I'm trying to deploy my website and bind dns to this website. So, the dns was used by the old website and now I need to access the dns setting page and modify its A Record and pair its domain name to its new ip address. The domain name is managed by yahoo small business. So I log in and done the changeup like this.

however, When I type the "vbridgetech.com" it does show the apache default page. But when I type "www.vbridgetech.com" it still goes to the old webpage. I thought the only thing I have to do is to change the old ip to new ip. Anyone has idea about it?