If you go to the products tab but you can't add anything to your cart and all the items are greyed out or NA, it is likely that your group does not have an open order. 

All available products will become available to add to your cart once there is an order in the status 'Open'. When the order moves to 'Pending' you will notice you can still view pricing but you can no longer add items to your cart.  

Another reason an item might be greyed out is that it is out of stock. When it comes back into stock, the ability to add it to your cart will return. 

If there IS an open order and you are seeing all greys or NA, another reason might be your email accidentally part of two groups which the system would not allow you to be. You can contact your previous group admin to remove you from the group