It looks like if you click on the subject (foods or whatever) at the top there it says something like Add a product. If you click on that it will let you post the product, MSRP, other info and a space for the review. Hope that helps.
It's a product registry so you can add things you have found helpful and hopefully we can compile a database of prepper goods that we can all access. I'm still working out the kinks and I will officially announce it Monday. I think this is going to be great for PreparedSociety and preppers in general. After it's up and running I'll add a few things to show you all how it's done then you guys can add what ever whenever.