There is a built in screenshot function in DD, with the hotkey ctrl-F11, which will save to the 'captures' folder in the DD folders. It does not work during cutsceens or conversations, so the print screen button is still handy. see also;
Screenshot Programsgraphics programs, for editing screen shotsfree web host with hotlinking? (for avatars) - some information may be out of date, as web hosts can change their policies or practices