For sites registered on or after April 3, 2021, you can access your newsletter app directly in your WordPress backend.
To edit an existing autoresponder, go to Newsletter > Autoresponder
Click on the email you wish to edit.
Here is the tutorial on how to use the editor: https://docs.mailster.co/#/editor
For sites registered before April 3, 2021, you will access your newsletter app via https://mail.musicprosite.com
Here are the relevant tutorials:
If you’d like to switch to the new mailing app, please send us an email.