WangGuard - Wysija Newsletter Connector is a plugin for connect WangGuard plugin with Wysija Newsletter.
Download and install WangGuard and Wysija Newsletter
Activate plugins through the "Plugins" menu in WordPress (if is a Multisite, WangGuard needs to be activated for the Network)
Updates are automatic. Click on "Upgrade Automatically" if prompted from the admin menu. If you ever have to manually upgrade, simply deactivate, uninstall, and repeat the installation steps with the new version.