First off, make sure you have created an account with Postmark.
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To get started, got to Configuration > Settings > Mailers, and create a Mailer for the "Postmark" Email service.
After that, you'll be greeted with a nice wizard that will help you set this up at Postmark. In order to start configuring this on your account, the wizard will ask for specifying a Postmark server API token.
How to create a server Postmark API token
- Log into your Postmark account.
- Follow these instructions in the Postmark docs on how to obtain your Postmark API keys.
Copy the Server API token to the Server API token field in the wizard at Mailcoach, and continue the wizard.