Hi Marcus!
Assuming you know the size of the grid squares you want, go to View and click "Show Rulers". This will pop up a ruler on the top and left of the image, and when your cursor is over the image you can see where you are ont he ruler. You can then use the line tool to make the grid lines.
Also, you can go to View and then click "Show Grid" but I do not know if this grid will print and I do not know how to control the size of the squares.
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