OK, here's the deal with the pictures.
When you upload pictures to the article system, the 'code' it gives you to paste is for the article system only.
Coming soon we will have a brand new gallery upload system that will be much more streamlined for getting your pictures into both articles and forum posts (as well as the gallery, which isn't really functional as of now).
Until then, to get your pictures that you uploaded in the gallery system into your forum posts, you have to go to the article page created for each picture, right-click on the picture, choose: 'copy image location' and then paste that code into your post and surround the code with the [ IMG ] [ /IMG ] tags (but remove the spaces in the brackets).
HOWEVER, this will give you your full-sized pictures which are
GIANORMOUS.
To get around this, I created a wiki 'army profile' for you:
http://www.dakkadakka.com/wiki/en/Faux_Pas_-_Space_Wolf_army
Which then allows the pictures to be re-sized down to 600 pixels as you were trying to do. Once that article had been created I was able to right-click on the properly sized pictures and choose: 'copy image location' (which now references the small pics) and paste that code into your post above (surrounding the code with the [ IMG ] tags).
So if you want to add more pictures, do so into your army profile first, and then right-click on the pictures and copy the code into your forum post.
Whew. . .Does that make any sense?