You can click the Form > More > Form Recognition button to recognize the blanks and tables automatically, then you will get the fillable fields created.
All the corresponding types of form fields will be automatically named with the text near the form fields.
Note: If the file you are working with is unable to be recognized to automatically create the fillable fields, PDFelement offers the ability to create a fillable form manually. PDFelement uses a group of buttons that can be used to create and design form fields in interactive forms