First, Press the button F8 in Toribash.
Second, Go to your toribash folders and go to the sub-folder screenshots
Third, get the screenshot and upload it to any file sharing website. Though I suggest
www.tinypic.com
Fourth, once the upload is finish, copy paste the URL here
Fifth, While posting click the button which is between the quote and hyperlink or the button with the mountains on it.
Sixth, Paste the URL of the image