Button one refers to the left mouse button. Button two is the right mouse click, or, if you're using a mouse without a left and right button, it is shift+click. Button three is pressing down the scroll wheel. Hope this helped! :-)
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It is in reference to the 'Right Click' on your mouse.
You don't donate on minecraft, you buy the game, which then regesters your minecraft username to be a account that has bought the game. If you mean how do you donate to a specific minecraft server, then go onto the server website, and they will probbaly have a DONATE button.
You click on The one that says Button 1 and type anything (Letters or Numbers) example, button 1 (You click then type the letter or number you want like A) So when you change it, it should be that letter that does that thing.)
It updates Minecraft to the latest released version.
At the bottom right of the minecraft homepage there is a download button.