1. Put your SD-card (gopro memory card) directly into your PC or Mac.
1. Take off the plastic shell from your gopro, then use the cable (usb to gopro cable)
2. Open folder that should now pop up on your either
a) macbook desktop
b) can't really remember how PC's react to usb's getting plugged in, well thats how you do it
so you just delete the files itself, not the DCIM file or anything like that. delete the GOPR04588.MOV, for instance. If you want to keep the shots for an edit or later or something, just copy it to some other folder, then delete the files you want gone in order for you to clear some space on your card.