Citadela Pro plugin is compatible only with Citadela Theme. Plugin extends free Citadela theme with advanced options that will allow you to customize look & feel of your website via WordPress Customizer.
- navigate to Plugins page in main WordPress menu
- click on Add New button
- click on Upload Plugin link to open file upload dialog
- choose zip file with plugin from your computer, and click “Install now” button
- after successful installation click on “Activate” link