Sorry can't find this simple feature. I was asked for document size at creation time but don't know how to change this later.
3 Answers
Select the Artboard Tool on the Tool bar (..or use the shortcut Shift+O).
You can then click an artboard and change its size with the options in the Control bar across the top of the screen.
Another method is to highlight the artboard in the Artboard Panel (Window > Artboards) and choose Artboard Options from the Panel menu.
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2Another way you can do this is just by double-clicking on the artboard you'd like to edit in the Artboard Panel. Commented Nov 27, 2012 at 5:30
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2And just in case you haven't found it yet, shift+O is the default keyboard shortcut. Commented Aug 30, 2016 at 6:43
Click on Window then select artboards
Then in that window click on the symbol to the right your artboard. This will bring up Artboard Options. There you can modify the width or height.
There's a Document Setup Button on top Toolbar. Click it and click Edit ArtBoard.
Source - http://www.wikihow.com/Change-Canvas-Size-in-Adobe-Illustrator
File > Document Setup > Edit Artboards
and then you can resize the artboard manually.