Slide down the notification bar and tap the usb thing, and it will ask you if you want to mount the droid for transfer, but you will be unable to access the sd card again till after you unplug it or unmount it.
when i connect my phone with the usb, no "usb icon" cmes up on my phone. also, the computer fails to install the drive successfully.... please help, desperately waiting. i have a samsung galaxy pro.