Jemrada

Hello, I have my whmcs setup in a sub-folder called system. My main part of my site is setup with wordpress in the root. All my wordpress links are http://www.ondcs.com and redirect to www if they happen to call non-www. I tried adding some 301 code in the .htaccess of the whmcs install folder, but nothing seems to make it redirect. I even tried adding it in the root .htaccess Nothing worked there ether. Any ideas on what to do?