To install If>So you must have a working version of WordPress already installed. If you need help installing WordPress, follow the instructions in WordPress Codex.
There are two different ways to install and activate If>So.
In order to use FTP, you will need a client program for your computer. The most popular programs are FileZilla and WinSCP. Both are available for Mac and Windows.
Next, connect to your server with your FTP program. Once connected you’ll want to find the Document Root (the folder containing all of your WordPress files) for your site. It’s often called public_html or has the same name as your site’s domain name, but it could be anything. If you’re unsure, please ask your host.
Once you know where your Document Root is, use your FTP program to go into
wp-content/plugins/. Then use your FTP program to upload the plugin folder created when you unzipped the plugin file.
NOTE: Make sure to upload the plugin folder, not the zip file. The zip file won’t function on your site.
Once the folder is completely uploaded, your plugin will be listed on the WordPress plugins page, and you can click on the activate link next to it.