You can press PrtSc to capture your screen (or Alt and PrtSc together to capture the current window only), and when you are looking at the ticket you want to add the screenshot to, simply press Ctrl (or Cmd on Mac) and V and a window will pop up allowing you to attach the picture to the ticket and give it a name.
JIRA can render screenshots on fields that is configured to use the JIRA Wiki Renderer, description and comments is one of them.
Have a read at https://jira.atlassian.com/secure/WikiRendererHelpAction.jspa?section=images and check how to display it.
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