[Wordpress issuses] zinahermez on "subscription/follow"

I see some bloggers who add free material to their website that can be downloaded, when a member follows them or subscribes. It is a tool used to get followers. Is this an option with wordpress.com or only wordpress.org? If this is an option with wordpress.com How do I go about adding this feature to my site. I would love to give a free give away with subscription. Please let me know..

I would greatly appreciate your feedback..

Sincerely,

Zina Hermez

The blog I need help with is zinahermez.wordpress.com.

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