Scale or change dpi to make a screen shot filt within printer margins

[Andersen, Verner Engell VEA]

Hello
 
I have several screen shots in my A4 manual that are too big to be
printed within the margins of my A4 paper.
 
How do I reduce the dimension of the screen shot to make it print within
the marigins? Do I resize or do I change the dpi settings?
Of course I still want the scren shot to print fine on my 600 dpi
printer
 
Best regards,
 
Verner Anderse
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