Log into the backend of your shop and open the "Modules and Services" tab.
Enter the term "easymarketing" into the search field of the modules list.
The easymarketing plugin appears in the modules list, now. Click "Install" on the right.
After successful installation, the plugin is opened directly. The configuration can be made there. If the plugin does not open directly, proceed to step 3 by clicking on "Configure" to configure the plugin.