Taking notes??

A friend of mine has a Nexus 7. He has tried out many apps for note taking where you can use handwriting. The problem he is having is the keyboard is the only thing that pops up. He is not able to use his stylus. Is there a setting within the app itself or the device that needs to be set? I don't own a nexus 7 so I am not able to answer his question.
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I personally don't like handwriting on these kind of devices, but that is just me.