When you are ready to put a video on your PSP, get a memory stick that is big enough to hold the file you want to transfer. Connect your PSP to your computer via USB and turn on the PSP, then go to the Settings Menu, select USB Connection and press X. Find the PSP drive in Windows Explorer and look for the POP folder. Create a folder called MP_ROOT, then create a subfolder named 100MNV01. The video you want to copy should be in mp4 format, and you need to copy it to the folder you just created on the memory stick. Now select Video and Memory Stick on the PSP to watch your video.