1. From the Persona Menu drop down in the top right, select onMessage
2. From the Approval drop down, select Event Registration
3. Next to Event Form Title, click Edit
4. You should land on the General Info section. If not, click General Info under Edit Registration on the left
5. Check the box next to Include Donation Field
6. Enter a Donation Label and Donation Description to appear by the field on the form
7. Click the Save button at the top

If the user enters a value in the donation field, it will automatically be added to their order total on the checkout page.