I'm using the Magento 1.9 Modern Theme and trying to add the third column but having trouble.
That's the link above, I can't get it to the right. Any ideas?
Under the CMS > Pages > Your page
Go to the tab "Layout" and choose 3-col layout and hit save.
After this go to System > Cache management and refresh at least "Block Html xxx"
Let me know if this helps
This webshop behind the link you added isn't based on Magento. Is that the webshop were you want to set the layout?