There are two ways. The first is: once you log into minecraft and you are on the title screen, click on options. Then click on Controls. Then click on whatever control you want to change, and press the key you want it to change to. The second way is to press escape while in the game and go to Options. Do the same thing as above.
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Look up the default controls on the minecraft wiki page, go to the control settings in minecraft, and change them.
There is no way to restore the default controls other than to find a list of the default controls somewhere and change them manually.
press I that's the default control unless you change the controls
if you haven't changed your controls, its 'E'.
Unfortunately, you can not change your name on Minecraft!