Normally I use Windows but I bought an Android TV stick and decided to install Danuntu which is a Rockchip RK3066 port of Ubuntu 12.10. Unfortunately, the wifi doesn't work.

I have a .ko file that is supposedly needed for my wifi adapter to work. How do I install it?

It's not that simple. For starters, that ko must be built for the same exact kernel version as installed on that stick. I'd be weary of a .ko that didn't come from a known source, and if from a good source it should have come with instructions on how to install it.

In short it would have to be copied to lib/modules/<kernel_version>/kernel/net/<appropriate_subdirectory>

1 members found this post helpful.

Thanks. I also know of this page. What should I do?

As goumba stated, it has to be built for that system. A ko file is a driver that is specifically tuned for the host system, either it's built on a similar system and you can try to "paste-n-copy or it is not, and you'll have to build it...
Basically it (as goumba suggested between the lines) involves getting the source code of the driver, unpacking it and building it. And, indeed, a "legit" bundle wil have all the credentials and instructions...and source is at any rate safer to use anyway...
So basically...you'll ahve to learn how to compile/build from source...eh, welcome to Linux, I'd say
Thor
Edit : maybe hovering a bit beyond the scope of what's being asked, still, this article could help too...
More edit : welcome to LQ!