1. Open a PDF and tap the "Signature" () tool from the toolbar in the bottom of the screen.
2. You will see the signature library and tap "Create Signature" to get started.
3. You could write on the screen directly using your finger or a stylus. Importing a signature image is available as well. Then tap "Done".
4. The signature you just created will be saved within the library. Simply tap the "Edit" button to manage/delete unwanted signatures.