First: Open a game you want to play. When you come to a point when you want to capture what's on screen hold down the "Ctrl" and "F5" keys at the same time.
Next: After you finish playing the game go to the folder where the game's Dosbox program is located. I'll use my copy of Pandora Directive as an example. So for me I would head over to the "C:" drive and then the "Games" folder and then finally the "Pandora" folder within it.
Finally: In the folder where the Dosbox program is located there should be a folder called "capture". This will be where the screenshot you took is located. Double click on the "capture" folder and any screenshots you took during gameplay will be there for you to view and use.
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