You have to have professional, not reader. Here is what I wrote to someone else who emailed me about it. Pretty straightforward.
Go to Tools->Advanced Editing->Forms->Text Field Tool
Then you just make text boxes in the area u want. To type inside the fields, click the Hand Tool on the Right Side (its a hand icon). Then type.
To edit font size or move the text box around, go to
Tools->Advanced Editing->Select Object Tool (arrow icon) and click (or maybe right click, can't remember) on the text box to format it.
Hope that helps.