Find an image hosting site. A good one is Image Coast as they have no pop ups and it's free for a basic account, which will be plenty.

http://www.imagecoast.com/index.php

Sign up, log in and click upload. You can rename your image before you upload.

Once an image is uploaded, you should see three sets of code (you might have to click on "my images at the top to see the three codes for each image). For this forum, copy the BB code and paste below here on TER where it says 'picture URL'.

Finally, cut the ends off the link so that http:// is the start and the .jpg is the end. In other words, delete the [url= from the beginning and delete the [/img][/url] from the end of the link. Click "post message" and you're done.