url changed to www

[webcreations]

I have changed my site's url from non-primary domain to www. If there is need to change all the site's url from all the places where we put the link whether it is in forums or blogs?? Give suggestions from an SEO standpoint.
Thanks in advance

[RH-Calvin]

You can use a redirection from the old domain to the new domain name and it will help to redirect your visitors to your website.