The following are the simple steps to add plugins:
Step (1) − On the left sidebar, Click on Plugins → Installed Plugins as shown on the screen.
Step (2) − The following page appears.
In this section, you can view the already installed plugins.
Step (3) − Click on → Plugins → Add New menu as shown in the following screen.
Step (4) − A list of plugins appears that are used in WordPress. Here you can directly install plugins from the available list or you can upload it by clicking on Upload Plugin.
When you click on Upload Plugin you’ll get the following page.