Cannot change my domain name to new domain in admincp

[kshs92]

I have some problem when I tried to change the existing domain name to new domain name which is registered at Goddady.com

So, I need the experts' advice to clear this problem.

I completed to set the domain forward to the existing webhosting domain and input the new domain name in Site Name / URL / Contact Details in admincp. But after then, my forums was showing the broken page (image, format) with white background, when I input the new domain name on browser address bar. I don't know why it is happening after changed the domain name...

Please, see the below detail what I have done.

1. Set the domain forward to existing domain at Goddady.com

Current Domain : aaa.com/forums
New Domain: www.bbb.com

2. Changed the existing domain name with new domain name on forum URL in Site Name / URL / Contact Details...

3. Input new domain name in address bar & press 'Enter'.

But forum format was showing broken...

I don't know what is problem on this...
please kindly advise me how to fix this kind of problem...

Regards