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With the Pen tool selected, hit the key and you will see the Add Anchor Point tool selected.
i don't know what to do
With the pen tool selected, try typing the letter "p". It should switch back to the regular tool, indicated by the little star next to it. You can quickly switch between regular pen tool, adding, and subtracting points with "p", "+", and "-" respectively (though you don't need to hold down shift).
Hope that helps. If not, please give more info (like which key you're hitting), and I'm sure we'll get you the answer you need.