Before you begin you will need to install Adobe Acrobat Viewer from the App Store. 

Step 1 Open the PDF form you want to fill in and select the Share icon

Select the share icon

Step 2 Select the More icon

Select the More icon

Step 3 Select copy to Acrobat

Select copy to Acrobat

Step 4 Select a text box and start filling the form in

Select a text box