If your plugin isn’t in use otherwise you would like to deactivate it, you’ll do that from the WordPress admin dashboard. you’ll be able to additionally delete
deactivated plugins.

1. Login to your WordPress admin dashboard.

2. under the dashboard menu, hover your mouse over “Plugins” and so click on “Installed Plugins”.

3. you can deactivate the Hello Dolly plugin, for that you need to press on Deactivate, which seems at bottom of the Hello Dolly text.

How to Delete a Plugin in WordPress?
Once a plugin is deactivated, the delete option can seem.

Go to the Installed Plugins list and click on on the Delete link that shows at the bottom of the deactivated plugins name. it’ll show a confirmation.
Press OK and therefore the plugin is going to be removed.