Is there an way to add a custom feild to a product? For example lets say i sell Shoes. The user picks the type of shoe in my list then i want the user to input Shoesize in a input text. (yes an input text). So after the customer have made the order it would logg this Shoesize input text on the users order. How is this possible?
Yes, it is possible in version 5.0.5. You can even change final price of product based on user input. You can add such fields in product settings aMember CP -> Products -> Manage Products -> (edit) Around the bottom of form you can see section 'Product Options'. You can add your fields here.