how to modify the register & internet

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Hi,

Just got that little wonder, truly happy until now. This forum answered most of my question but:
* I want to know how to modify that register (saw several topic giving command lines but how do we use them?)
* Is there a flash player available to get streaming from the net (bad exemple but such site as pornhub require a flash player). Are those video possible to watch?
* I tried to download a video from youtube but, the device tell me that I dont have enough space, isn't it possible to open onto to the sd card (4gb).
*would you have a website that provide apps, games and other usefull stuff?

Thanks