Login to your hosting control panel,
click on the parked domains,
there you can add the required domain sir

Domain parking is not Addon domains.(Eg) for domain parking:If you have 2domains abc.com and abc.co.in. Where abc.com is your main domain in which your site is hosted and abc.co.in will be the alaise domain.Which means when you type abc.co.in. It will be redirect to abc.com.