thebuilder Here are some useful shortcuts:
Ctrl+Shift+U Hides the UI for screenshot purposes.
For taking Screenshots I use Alt+PrtScrn, then paste them to an image editing software (The easiest I found was MS Paint, don't know what to suggest for Macs)
Go to paint, press Ctrl+V, it should show up.
Save the file, attach it to a post here, and voila!