Installing the simple membership plugin is very easy. Use the following steps to install this plugin. You can use the same steps (outlined below) to install any addons/extensions also.
Step 1) Go to the Add New plugins screen in your WordPress admin dashboard area.
Step 2) Click the Upload Plugin button.
Step 3) Browse for the plugin’s file (simple-membership.zip)
Step 4) Click Install Now and then activate the plugin.