The JIRA documentation seems to be missing a page on the issue operations available on the view issue screen, such as move or copy issue, add screenshot, etc. Please add these basics under the 'Working with Issues' section of the JIRA User Guide linked from:

http://www.atlassian.com/software/jira/docs/v3.11/introduction.html

I can't find anything useful when searching for 'screenshot' and the only assistance on moving issues is under the bulk operations page.