I have a digital photo frame for model DP-C762R, but I don't know who the manufacturer is. I cannot find my manual which would help me load and save some photos on the frame. I have done this only once before and can't remember how. I have an sd card which I put in and I can see my photos, and I can go to one that I would like to save to the hard file on the frame, but I don't know how to do this. I have fiddled with buttons and at once time saw a save, but I couldn't use it. Please help. Thank you.