HOW TO DISABLE AND DELETE WORDPRESS PLUGINS FOR FREE?
In this tutorial you will learn two ways how to disable and delete WordPress Plugins. In ‘Tutorial 1’ you will learn the most common way used directly from WordPress Dashboard. Sometimes that way does not work and in ‘Tutorial 2’ you will learn how to do it from cPanel.
Tutorial 1: WP Dashboard
Step 1. Log in to your WordPress ‘Dashboard’.
Step 2. Click ‘Plugins’ in the navigation menu.
Step 3. Find the plugin you want to disable, and click the ‘Deactivate’ link.
Step 4. You will then see a message stating ‘Plugin deactivated’ and your plugin is now disabled.
Tutorial 2: cPanel
Step 1. Login to your ‘cPanel’.
Step 2. Click the ‘File Manager’ in the Files section.
Step 3. Navigate to your WordPress installation folder, and open the ‘wp-content’ folder.
Step 4. Right-click the ‘plugins’ folder, then select ‘Rename’ or ‘Delete‘.
Step 5. Rename the plugins folder, for example “plugins.old” then click the Rename File button or simply choose to delete the plugin entirely.
Step 6. The WordPress plugin is now disabled or deleted depending on your choice.
Source: InMotion Hosting