In a hurry.
You can’t. No blogger initiated advertising is allowed.
There is only one advertising program called WordAds at WordPress.com and it’s for blogs on their own domains. This is the homepage for the WordAds program: http://www.wordads.co/ There you will find the application page as well as FAQs.
Aside from a blog being accepted into WordAds, no blogger initiated advertising, retailing or reselling the work or products created or services provided by anyone other than yourself is allowed on free hosted WordPress.com blogs. E-commerce transactions via shopping carts and the like cannot be conducted on free blogs from and being free hosted by WordPress.com
Note: There is no upgrade you can purchase from WordPress.com that changes anything stated here http://support.wordpress.com/com-vs-org/ and restated again here > http://en.support.wordpress.com/domain-mapping/#important-notes-before-upgrading and restated again here > http://en.support.wordpress.com/custom-design/#frequently-asked-questions
If you do require an ecommerce site, advertising and/or affiliate links you can hire a web host and get a free software install from http://wordpress.org Refer to > http://support.wordpress.com/com-vs-org/
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