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You'd have to sudo it if you aren't su. It requires kernel permission levels that users simply don't have.
That said, I just push the power button on my computer. On both my laptop and my desktop, the kernel intercepts that button push and shuts down properly. I have no reason to suspect that it wouldn't work for you, either.
Visudo is actually vi, so you've to learn how to use vi.
Basically when you enter your are in "read-mode".
Try moving with the arrows, if you can't, use h,j,k,l to move the cursor.
Place at the character you want to remove (the #) and press x to delete the character.
If you need to input some text, press the i key, type what you want and go back to read mode using ESC key.
To save press
:w will write the file, :q will quit, and if you need to quit without saving, use, :q!