Click the Admin icon on the navigation menu on the left.
2. Under General Administration heading, locate Event registrations.
3. On the Events page, select the event where you want to add custom fields, click the three dots icon and select Edit
4. On the Edit Event page, scroll down and look for the Custom fields area.
5. Click the plus icon on the right.
6. Type the name of your custom field and type (textbox, multiline textbox, dropdown, dropdown with "other" option, checkboxes, radio buttons).
If you select dropdown, dropdown with "other" option, checkboxes and radio buttons, you need to indicate the items that the registrants can choose from.
7. Click the Save button.
8. Click the Update button at the bottom of the page.