Method 1: From the top annotation toolbar
1. Select Annotate Toolbar. If you don't see the top toolbars, tap the center of your screen to bring it up.
2. Tap where you want to add text.
Method 2: From the quick tools menu
Tap and hold on where you want to add text until the quick tools menu pops up, then tap Text icon.
Creating a text markup annotation
Signing documents and saving signatures
Using full document text search
Using Stylus as Pen mode
Converting handwriting to text
Changing the font of a text annotation