How to install an operating system?

I know that this is weird, but I have no idea on how to install an operating system onto the computers. (I am using an Advanced One).

I an relatively new to the mod, and brand new to the forums, so sorry if I am posting this to the wrong section.

Thanks a lot in advance for your assistance!

Which one, specifically? Many of them have an installer program you can run after downloading it from pastebin.

As Lyqyd said, which one/s? Also, what version of ComputerCraft are you using?

If you're using 1.65 you should be able to just type the Pastebin command in. Other versions might need some work to get HTTP working.

If you look at a operating system thread there will usually be a install section with the "pastebin get (thecode) startup"