Hey Aphrodite,
Yeah, the code's ridiculously massive, I know what you mean haha. Alright, for demonstration purposes I've uploaded this picture of one of my kittycats enjoying my laptop:
Yes, she
was on Google searching for cats, before anyone asks.. Haha. Poor lonely thing (question is, who's worse - me, for searching it and taking the picture.. Or her for winding me up by laying on my laptop in the first place?

). Anyway... In order to get that thumbnail to show up, I had to paste this code:
URL=
http://img62.imageshack.us/my.php?image ... rgesw2.jpg IMG
http://img62.imageshack.us/img62/2826/d ... sw2.th.jpg /IMG /URL
This code is the 'Thumbnail for Forums(1)' that's shown on the ImageShack site once you've uploaded the image. Bear in mind that in order to show you the code, I've had to take the square brackets out, so it doesn't just show up as the thumbnail again! But make sure you leave the code completely intact, or it won't work.
All you've gotta do is click the box that has all the code in, next to the 'Thumbnail for Forums(1)' text - this'll make it automatically select all of the code in the box.
Next, either hit CTRL + C... or you can click 'Edit' up at the top, then 'Copy' from the dropdown menu.
Fly back over into here, and then hit CTRL + V, or 'Edit' then 'Paste'. Leave a space or two after the code, and then ignore it

. As soon as you hit Submit, it'll be converted by the wonders of HTML / BBCode into a glorious thumbnail for us all to see and click

.
Apologies if the method sounds a little patronising, I'm just not sure how familiar with computers / Copy-Paste you are. If I've completely misunderstood your problem, let me know and I'll help you out again.. Hopefully correctly that time

.
Good luck! Can't wait to see the pictures

.
Elem