Hi Shuby Arora,
For submitting the product, as you know the link, open it select product from the two options of product and business.
Select respective catagory which type of product do you wish to post.
Then open the link, you will be given with different columns to post as per the product type.
Submit the product by saving.
For product reviews, select any product which is there in the IRC, and click the link at the bottom of the product details as write reviews, you will be there to write the reviews of that particular product. Write reviews in your own words. Save it.
RK - Some thing special