Scutter01 directed me to post this. I hope it can be appended to the already posted thread for posting pictures using a PC/Windows.
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Posting Images for Mac OS X. (Easily done in under one minute)
1.
Install Imageshack dashboard widget. Download this http://reg.imageshack.us/iShack.wdgt.zip and install it in your Dashboard.
2.
Any image you see on your screen, just take a snapshot of it.Press the key combination Command+Shift+4. (Command is the cloverleaf/Apple key) This will save the screenshot to your desktop and name it 'Picture 1', incrementing the number as you save more.
3.
Upload the image to imageshack.
Left click, and start to drag the 'Picture 1' file, keep the button depressed and press F12
F12 is the default Dashboard key. If you changed the mapping of F12, just use whatever key you changed Dashboard to.
You will see the Imageshack drop-box appear. Keep dragging the image until it's over the frog. Release the mouse button.
Imageshack will now upload the photo to the server.
Click on the link to the right of the frog box. Copy that image URL to your clipboard.
4.
Return to the INGO post and insert image.
Click on the Insert Image icon in the forum page. Paste the URL you copied from the Imageshack dashboard widget.