This is what I have figured out so far...
The buttons---apparently, to turn the screen on, you hold down the play/pause button.
--To select and option, you will actually be using the "M" button at the top, NOT the play button--the play button is actually the delete button in some menus.
--To go back to the main menu after you entered an area, like video or photo, hold down the "M" button.
--I haven't figured out how to lower the volume yet...
--Another reviewer kindly put instructions on how to upload video to this device, so you might want to look through that.
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As for a review, I probably would personally not recommend this product. Yes, the video quality is nice, and it has a lot of neat options, but it is hard to navigate and comes with insufficient instructions, so I get the feeling most of the people who have purchased this do not/cannot really use all the features because they can't figure it out, which negates the value of having so many convenient features in 1 product.
The music player part has a nice-looking interface, but it all seems useless since I can't really use any of the dials or buttons I see in the graphics--or at least I haven't been able to with the limited buttons on the actual product.
I think it would be worth shelling out a few more dollars for a better-designed product, maybe with a dial, more buttons, or maybe a touchscreen or something.