it came with a usb cord. you have to plug the usb into the phone and the pc. then copy the files you want from the pc to the phone. however, it depends on the file types of the pics and videos as to whether or not the phone will recognize them. it supports many file types, but not all. also, before you plug it in, there is a function somwhere (i think in settings) to tell the phone that you are going to use it as an external disk. and there is software on the phone that, when you plug it in to the pc, you can install onto your pc.
the other option is to take the micro sd card out of your phone and put it into your pc and just copy the files from the pc to the micro sd card. then put the card back into your phone and look for the files (you will need to get a file explorer of some sort from the market. i use ES File Explorer.....free app from the market. it works kind of like windows explorer).