Your Zeevou website includes a default Newsletter section where guests can subscribe by entering their Name and Email Address and clicking Subscribe.

Go to Websites → Newsletter Subscriptions on the dashboard.
You can see all subscribers in the list.
Click the three dots next to each subscriber to Edit or Delete their details.

As a host, you can also add subscribers yourself:
Go to Websites → Newsletter Subscriptions.
Click Add a Subscriber.
In the drawer that appears, enter:
Name
Email Address
Click Add to save.

This ensures your newsletter list stays up-to-date and includes both guest sign-ups and manually added contacts.