Donorbox has a powerful form builder that allows users to add custom textfields, dropdown, and radio fields to your donation forms. Here's how:
Log into your Donorbox dashboard and click the Edit link next to the form you want to add the question to.
Click on the Custom Fields tab. Click the toggle button marked "Ask Additional Questions" so that it is On.
Add your question and the format of the response you want. A maximum of 10 questions is allowed.
The format of your donors' response can be a text box, a checkbox, a selection from a dropdown box or a radio button. You can set which screen you want the question to appear on. You can also make any of the questions mandatory.
Click Save or Update when you are done.