To enable annual recurring donations as an option on your form, simply follow these steps:
1. Log in to Donorbox with your organization login details and go to your Campaigns Page.
2. Click the edit icon on your campaign form.
3. Next, click the 'Essentials' link under the 'Your Donation Form' header.
All the available recurring donations will be shown under the section marked 'Donation Intervals'. Select the annual recurring interval.
4. Click 'update' or 'next.' Donors will then be able to make a yearly donation on your form.