Constant Content

Can someone please tell me what I need to put into the boxes concerning free content? I do NOT want my articles to be free content, but twice now it has! Do I put a zero for set to free content or what? Any help most appreciated.

Thanks,
Tat

It says right below (or next to) each one:

Usage Price $ Set to zero for free content

Unique Price $ Set to zero if you don't want a unique price

Full Rights Price $ Set to zero if you don't want a Full Rights price