Updated October 31, 2013: As the tutorial was out of date due to changes on dA, I have updated it.
1. On the right hand side of a deviation you will see some buttons.
2. Scroll down until you see the "Details" section.
3. Don't freak out!
The code on top is a direct link
to the deviation. It is also shorter, and therefore easier to use.
The middle code is your thumb code
. This code will be displayed on journals and pages of Premium Members. It will also display in notes even if you are not a Premium Member.
The bottom code is an embed code use this on other websites to embed the image to the page, but have it link back here!