To upload a WordPress plugin, you will need to follow these steps:

1. Go to the WordPress Dashboard.
2. Click on the “Plugins” menu and then the “Add New” button.
3. Click on the “Upload Plugin” button.
4. Click on the “Choose File” button and then select the plugin file (in .zip format) from your computer.
5. Click on the “Install Now” button.

After installing the plugin, click on the “Activate Plugin” link to activate it.