cPanel Add-On Domain - www.newsite.com becomes mainsite.com/newsite.com

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http://serverfault.com – I apologize for the elementary question. I'm using cPanel and trying to use the Add-On Domain feature. My main site, let's say www.mainsite.com, is working fine. However, when I try to add on a new domain, www.newsite.com, I run into a problem: everytime I try to go to www.newsite.com, I end up at www.mainsite.com/newsite.com which is not what I'm intending. I've added an index.html into the newsite.com folder but it is not working. What should I change within the cPanel so that newsite.com properly goes to newsite.com, rather than www.mainsite.com/newsite.com ? Thanks (HowTos)