You can use the Newsletter section so your customers can signup for your mailing list by following the steps below:

1. Visit the designer
2. In the top toolbar, click [Sections]
3. In the Sections right sidebar, click [Add section]
4. Double click the [Newsletter] section in the modal to add it to your website
5. In the designer area, scroll down to the Newsletter section, and hover over the section
6. Click [Edit section]
7. In the Newsletter right sidebar, you can specify what email address to be alerted to when a custom has signed up for your mailing list and customize it as you see fit.

Note: You can export your customers’ emails after they signed up for your newsletter.