Don't know how to upload image
Go to http://www.tinypic.com
, hit 'choose file' button, find your pic (easiest if you put it somewhere you can find it easily), left-click the pic and click on 'open' at the bottom-right, click 'upload now', do what it says to get past security, then left-click (to highlight it) on the second line down on the page that comes up, which has the UBB code already on each end, and right-click to copy the link. Just paste the link into your post (don't add any UBB code - just paste it in, on its own line so you don't force a wide post), and the pic will show.
There are, of course, better sites out there for photo storage and management (tp doesn't do either - just hosts it), but to put a pic up quick, without creating an account or anything, I use tinypic. Sounds like a lot of steps, but it takes me less than 30 seconds to post a pic that way.
Like this one.
Hit the 'quote' button on this post to see what the format looks like if you want.