giafa on "[Plugin: SpeakUp! Email Petitions] how to add a field?"

Hi. I use Speakout to manage a petition on the website of our association (http://petizione.riscatto.info).
I need to add a field with informations about "activity".
I added a field to the table "dk_speakout_signatures" in my mysql database.
Unfortunately I have a bad knowledge of php. Can I have a suggestion on how I can add it to the application form of users ?
Thanks for your work

https://wordpress.org/plugins/speakup-email-petitions/