Best way is to upload the image to a host like imageshack. From there copy the image url for forums. When you go to post it here, click on the "insert image" icon from the tool bar above and paste the image url. Click on preview post to see if it worked. If all looks good click "submit reply".
Start thread or during reply.. scrollllll down untill you see
"manage attachments" you hit that button, find the file on your harddrive, upload it then close the window... it will not show up untill you either hit send or preveiw
Attach Files Valid file extensions: bmp doc gif jpe jpeg jpg pdf png psd txt zip