Donate button feature will allow you to add a custom button inside your public podcast website. This button will allow you to add the page of your choice to redirect your users to an external donation site.
In order to configure your Donate button, you need to have an active Donate system website page. There are a lot of services, the simplest ones are Gofundme, Paypal, and Patreon. Choose the one that best suits your needs.
When you got your custom URL you will be able to add the URL inside your podcast dashboard.
1- Click the "monetization" tab of your dashboard.
2- Select the "Activate" button inside the "Donations and funding" section.
Then add your custom donation website URL and click the "Enable donation" button