howdy!
as has been awesomely reflected,
there are several online options for hosting of images.
This creates a hyperlink, which you can copy (depending on your platform).
I use my own bloggr as the image hosting, having in the past used picasa and devart.
If possible, copy the "view image now" link, from the public-facing domain,
rather than a hotlink from your personal profile etc...
(ie, you may have to google your own image to get a broader hyperlink than other options).
this way, you know the link should work for the most people.
Then, when posting,
you click on the little picture icon (next to the Bold, Italics and Underscore formatting buttons)
which will write
[ i m g ] [ / i m g]
^( no spaces in the above blocks)
then
you put the hyperlink into your image
[ i m g ]|your hyperlink goes here|[ / i m g]
If it works, it will show an image where the img code block was.
You can also on proboards forums, use special parenthesis code to specify the image border and size...
though you'd have to wiki that as my
code-fu skills are weak
I look forward to seeing what you'll share