Step::1 Login to your Joomla dashboard
Step::2 Go to Extensions tab and click on Manage section and again click on Manage
Step::3 Select the extension which you want to remove and click on Uninstall icon at the top
Step::4 Confirm the uninstallation process by clicking on Ok button.
In this way your desired extension will be removed from your Joomla website.
Visit our Blog for more details. You can also watch the video here.