Here is a guide how to install a plugin in WordPress from its ZIP file:
As a very first thing you need to have your plugin ZIP saved on your computer. In this tutorial, we’ll our Tish Social plugin as example:
Next step is to login to your Admin Panel and navigate to Left Menu -> Plugins -> Add New and click on ‘Upload Plugin’ button:
Then click on ‘Browse’ button:
Then select plugin zip file from your computer and click ‘Open’ button
Then click on ‘Install Now’ button
If the plugin is installed successfully, you should see the following screen.
Please note, the plugin is Not activated. It can be done by clicking on ‘Activate Plugin’ button:
Then you should see a successful message and your plugin listed into activated plugins list:
