Note: PS2 USB ports are USB 1.1, which causes slow loading times and potential stuttering in video cutscenes. If you'd like, I can:
Extract the Free McBoot files and copy them to the root of your USB drive. Mcboot Download Usb
Open the Open PS2 Loader (OPL) app from the Free McBoot menu to launch your games. Note: PS2 USB ports are USB 1
Follow the on-screen instructions to install Free McBoot onto your PS2 memory card. Playing Games from USB: Mcboot Download Usb