Soda PDF is often used to fill out forms. It recognizes form fields and lets you fill them out. As an added benefit, even if the document is not configured to be a form, Soda PDF’s editing tools can be used to insert text at the appropriate location. Click here to learn about adding text to your document.
Filling out a form field:
A form field is a designated part of your PDF file that captures specific types of data. To fill out a form, you will need to be in View Mode. You can click on View in the top left corner of the application to switch into this mode. 
You may use the Highlight Form Fields option found in the Forms Module to quickly identify which portions of the document are form fields. Toggle this on and off and the form fields react accordingly.
When you select your form fields, you will be able to interact with them and fill out the form. 