Press the button assigned to "Refresh" (usually Triangle or Select) to load the list from your text file.
Installing the app is only half the battle. If you open PKGi now, it will likely be empty. You need to tell it where to look for data. On your USB drive, create a folder named pkgi (lowercase). ps3 pkgi install
Your console must be jailbroken. PKGi will not work on official firmware (OFW). Press the button assigned to "Refresh" (usually Triangle
Download the latest .pkg file from the official GitHub repository or a trusted homebrew site. ps3 pkgi install