This addon allows you to add as many custom form fields to your OptIn Pages as you need
Custom Form Fields Add-on for OptIn Ninja Features :
- Add an unlimited number of custom fields
- Choose from the following form field types:
- Edit field placeholders / help text
- Field names can be edited to ease autoresponder integration
- Mark selected fields as required
- Validate input
- Easy configuration
- And many more. Check official website for more info