Mailster has four built-in widgets you can use. Find them in the Appearance menu of your WordPress site.
If your site uses a Block theme or Full site editing, you can still use these widgets but may find better support for dedicated blocks.
Signup Widget
Embed your signup forms everywhere where widgets are accepted.

You can choose the form and the title of the widget. If you like, you can display additional text before and after the widget.
Latest Newsletter
Display the latest newsletters as a list. Mailster will use the latest regular campaigns, which are either queued, active, or finished.

Subscriber Count
Display the number of subscribers in your sidebar.

Use the Prefix to add text before and the Postfix field to add text after the number. You can also round up to the next even number.
Display a Subscriber Button
Read more about subscriber buttons here.

Use the Prefix to add text before and the Postfix field to add text after the button.