The plugins section will not appear on the WordPress dashboard if you don't have the Administrator role. If the website's owner asks you to edit or install a plugin, you need to ask to increase your user role. You can find the name of the administrator at WordPress Users > All Users Menu.
How do I enable add plugins in WordPress?
If the Plugin does not appear in the Plugins List, view the Plugin's main file to ensure the Plugin's header text exists and is properly formed. The main file in each plugin should have a file header that shows basic information about the plugin.
Why plugins are not showing?
Go to your WordPress dashboard, then choose Plugins. Navigate to Add new option. Now you can browse all plugins in WordPress.