It's been quite some time since I used the free version but I don't think it has the ability to add these things to your page to be used in forms.You will have to hard-code them. The upgraded paid version includes this ability and more.
Sorry but jtarin is right, unfortunately the free version hasn't the ability to create forms and internal fields in a graphical way. In the future I'll release a more powerful free version that will have this feature.