Step 1: Download the quadmenu-master.zip file from CodeCanyon. This file contains the complete QuadMenu Plugin package.
Step 2: Unzip the file with WinZip or WinRAR.
Step 3: Open your website’s WordPress admin panel at mysite.com/wp-admin/.
Step 4: In the WP dashboard go to Plugins > Add New.
Step 5: Click on the Upload Plugin button, at the top of the screen.
Step 6: Click the Choose File button and use the popup window to browse for the quadmenu.zip file and select it. You can find it in the unzipped package. Please note, you need to upload the quadmenu.zip file, NOT the quadmenu-master.zip file.
Step 7: Go to Plugins > Installed Plugins and click the Activate button, under the QuadMenu name, in the plugins list.