The easiest way is to set up a photobucket account.
Then download your pics to there.
Choose the pic you want (put your mouse over it and then move down and click the little square at the bottom) and scroll down the page and click on 'generate HTML...'
Then it takes you to a new page and scroll down to the bottom of the page, highlight the 'Image for message board' link, make sure you get all of it (it will have the [IMG] in front and behind the pic link).
And then right click, then click copy on the pop-up menu.
Then come back here to your post.
Click on where you want the pic to go.
Then right click.
Click on paste in the pop-up menu.
Hopefully that's clear enough for you. Good luck.