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There should be a PrtScn button on your computer. It will copy the screen into the clipboard. Alt Prt-Scn will copy only the active window, but may be harder to trigger in cases involving modifier keys. Once you've copied to clipboard, save it to your favorite image editing program (I use Gimp, but Paint will work too), adding annotations if you'd prefer. When writing a reply in anything but Quick Reply, you should see a paperclip icon above the next. That's the Manage Attachments dialog. You'll click on Choose File, select your file, click Open, and then click on Upload in the Manage Attachments dialog. Once it's done, close the window and it should be attached to your post.
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