First we will will choose plugins in WordPress panel
Then we will choose add new
We can search for plugins, upload plugins and choose plugins from featured, recommended, popular and favorites
I searched for a plugin which is called akismet as you can see in the photo below and it is listed in the search results
After I press install and activate, the plugin is successfully installed and will be in my plugins list
I can change the settings of my plugins, deactivate them and delete them If I want as you can see in the photos below
As I press deactivate I will see in a few seconds that the button has changed into delete, when I press delete the plugin will be removed from my website and from the list of my plugins. I can always reinstall it If I wish to do so