Dynamic Data Fields
To show the popup panel with the data field properties, double-click on the field. In fact, you should double-click two times: first to activate the editing mode, and the second to bring up the properties panel.
For Counter, Page Number, and Date and Time, the properties panel lets you change the data format. For example, the page number can look like "3", or "3 of 11", or "3/11".
If you double-click on the Address Field, you'll be able to choose what kind of contact information to insert.
The File Data lets you select a text file to import from, as well as to make some settings.
Since dynamic fields contain text, you can format it using tools from the Text tab of the Inspector.