In this pic, you see installed, I already have the plugin installed. For you click on the install button. Its going to take you to the page where you will see it installing, and at the end when the installation is done. After the installation is done, click on the activate button. It will activate the plugin so you can be able to use it. After activation is done, you should see the page where you have all of your plugins listed. If you don't , you can just hover over plugins with your mouse and click on installed plugins.
When you are on the list of plugins, look for the plugin you just installed.

If you notice the plugins are listed in alphabetical order. If you scroll down, you will see that the plugin is listed and installed. There is nothing else you need to there. On the next page, we will configure the plugin.