You can hit the reply with quote button on his post to see how the Spoiler Tag works.
Anyway, you shouldn't even have to use it. Heck, you shouldn't even have to resize ANY of your pictures. Don't have to do it with the +18 pictures since they're links to somewhere else anyway.
As for the safe images, just use thumbnails like I said before. Here's a review, now with visual aids:
After updating your image, click:
http://i.imgur.com/NdatK.png
Then copy everything that's inside of the box that says:
http://i.imgur.com/eKZtY.png
and paste it directly into your forum post. You should end up with something like:
http://i.imgur.com/QxQU2s.jpg
And if you click on that picture, you go to a different page where the whole picture in its original size will be shown.
So once again, there's ABSOLUTELY no need to resize any image at all. Heck, I feel like asking you to please repost all your images in their original size using what you've learned just so we can enjoy all of them in their full glory. (if it's not any trouble that is)
Here's two more images by Mitha before I go and restart this laptop:
http://i.imgur.com/elbf7s.jpghttp://i.imgur.com/ZRYtUs.jpg
As you can see, using the thumbnails makes it so that you can paste a picture right after another, saving up even more space.