Heres how to do it:
go to: http://imgur.com/
Step 1: Find the 'upload images' tab on the side (circled in red pen below) and select the 'computer' or 'web' upload button
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fu3XZR.png&hash=c95f9a66db494a149e1c70f39b015f7f)
Step 2: You may select as many images as you want. When you have found all your images, click on 'start upload'
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fm9HOj.png&hash=503c09ea83590dab6459ceb5390d3202)
Step 3: After your pictures finish uploading, you will be brought to this page. I highlited the link you need (BBCode). Copy it.
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Ff9Kh2.png&hash=21c36790a7006d84145a8e7d30a54c66)
Step 4: in your 'post reply' or 'start new topic' message box, just paste the BBCode.
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FAOHDJ.png&hash=af820e26bd152c1d88059861499f60d2)
Should come out something like this:
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FocQrW.jpg&hash=195e056584b118bd6ca2042bad37a0b9)
All done!