It's common to want to add "www" to a domain name, so that users typing in the "non-www" domain name, will get to the right site. It's important to implement this with a 301 redirect so that search engines recognize that there is only one true and real site. The traditional way to do this is:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^euphline.com$
RewriteRule (.*) http://www.euphline.com/$1 [R=301,L]