You can install Mailster by going to your Plugins page and click on the “Add New” button on the top of the page.
Continue by clicking on “Upload Plugin” and selecting the mailster-x.x.x-zip from your dektop. Click on “Install Now” and the package will get uploaded and extracted on your WordPress site.
After this step you can directly activate the plugin.
If you are using a fresh version of Mailster you will get redirected to the Setup Wizard which helps you to setup Mailster to your needs.