The | is top right, under the backspace key, on most keyboards. Right beside the [] keys, which you use a lost in wikis also. Good right pinkie exercise.
A few basic image tips.
Images will left just by default, if you add nothing to the [[image source]] info. If you put in any formatting, like a frame, size specification, and caption, they will automatically right just. So in most cases you do not need to use left or right commands.
I updated the one on the barb
leap attack page a bit. Here's the code now.
[[Image:Jump.jpg|thumb|300px|The Barbarian hops a river.]]
It's easiest to upload full sized images, then use the thumb code to make them appear as you like on the page. Just do what I did above. Pipe |, thumb, then the desired display size, in pixels, with "px" after it. Then another pipe and the caption. Try to keep captions brief so they'll fit in one line. It looks neater that way.
Thanks.