Hi Orlando,
Products are not sold directly but via Offers. After you define your products you need to define Offers to sell the products. This allows the possibility to bundle more than one product in an Offer. In the future I will make a"New Product Wizard" to hide the complexity since most cases will be a 1 to 1 correspondence between Products and Offers.
btw, if you have not noticed there is a new release of mojoPortal with some nice enhancements so you may wish to upgrade your installation.
Hope it helps,
Joe