Add text using the Typewriter tool

Use the Typewriter tool to type text anywhere on a PDF page. Organizations sometimes provide PDF versions of their paper forms without interactive form fields. The Typewriter tool provides a simple solution for filling out such forms. The Typewriter tool is similar to the Text Box tool, but includes a different set of default properties.

1. Choose Tools > Typewriter > Show Typewriter Toolbar, and then click the Typewriter button.
2. Click where you want to type, and then begin typing. Press Enter to add a second line.
3. To change the text size, select the text, and click the Decrease Text Size button or the Increase Text Size button in the Typewriter toolbar.
4. To change the line spacing (leading), select the text, and click the Decrease Line Spacing button or the Increase Line Spacing button.
5. To move or resize Typewriter text block, select the Select tool, click a Typewriter text block, and drag the text block or one of its corners.
6. To edit the text again, select the Typewriter tool, and then double-click in the Typewriter text.
   Note: To let Adobe Reader users type text in a PDF by using the Typewriter tool, open the PDF in Acrobat Professional, choose Tools > Typewriter > Enable Typewriter Tool In Adobe Reader, and save the PDF.

Source: Adobe