How to redirect site url to www in pligg

How redirect site url to www for pligg.I dont have more knowledge about pligg.So please provide me the help.

example:http://example.com to开发者_如何学Python http://www.example.com

Thanks

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Setting your site base to address without www

edit .htaccess

replace

RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^\/?(.*)$ http://www.%{HTTP_HOST}/$1

to

# Fix trailing slash problem
RewriteRule ^([^\.]+[^/])$ http://infoneo.pl/$1/ [R=301,L]
# Remove www., always.
RewriteCond %{HTTP_HOST} ^www\.infoneo\.pl$ [NC]
RewriteRule ^(.*)$ http://infoneo.pl/$1 [R=301,L]
##### Re-directing End #####

infoneo.pl change to your site base address

From: http://discussion.dreamhost.com/thread-87381.html