How to install the Addons Manager
1. Download the zipped file of Addons Manager
Click on this link to download the official Addons Manager for Newsletter. Be sure that your system doesn’t automatically extract the zipped file: if it does, you should still be able to see the original, zipped file on your download folder.
2. Go to your WordPress dashboard
Go to your website WordPress admin area and visit Plugins » Add New page (you can find it in the sidebar). After that, click on the Upload Plugin button on top of the page. Select the Addons Manager zipped file that you just downloaded.
3. Activate the plugin
After the upload completes, a new page will ask you whether to activate the plugin. Click “Activate”.
4. Go to the Addons Manager
Now that the plugin is active, you can go to your Addons Manager by clicking on Newsletter > Addons Manager from the sidebar. From now on, all the available extensions for Newsletter will be activable from the Addons Manager.