You can fill out forms in Acrobat Reader by
To fill out a form:
1 Select the hand tool .
2 Position the pointer inside a form field, and click. The I-beam pointer allows you to type text. The arrow pointer allows you to select a button, a check box, a radio button, or an item from a list.
3 After entering text or selecting an item, check box, or radio button, do one of the following: Press Tab to accept the form field change and go to the next form field.
This works for Acrobat Reader 4 onwards (it may work with earlier versions but I haven't got them)
Hope this helps.