• Download a plugin 
• Open left side Plugin →  Add New 
• Click on top of the page the Upload Plugin button
• Find the plugin on your hard drive which you downloaded before. 
• Activate the plugin through the 'Plugins' menu in WordPress. 

Install plugins 

There are several ways to install plugins, however, the following approach works for Plugins and Widgets in every case, so let’s make it like this:

Find and use plugins

Plugins can be everywhere on the left side in your backend. Many plugins just populate their own place on the right side, like for instance the REAL plugins; some plugins are nested in Settings like the CSS Tool Tips or Shortcode any widget; in a few occasions they take maybe place in Tools like Redirect your Page, or they take place in Appearance like the Duplicate Menu plugin. Best advice we can give you is to read the installation notes.