I created a portal and added it to my form and added the fields I wanted to the "Add Fields to Portal" box. What I have in edit mode
However, after going into browse mode, the portal is empty. What I have in browse mode
For a portal to show related data you need a relationship in place between the two tables. On the Help menu in FileMaker you will find a link to the user guide. There you can find out how to easily set up relationships and other basic things to get you started.