Follow this guide up to step 2, step 2 doesnt work well because the codes are now invalid. If you haven't made an account yet the guide to doing that is also in the link below.
Now for step 2 of activating your account you would go to this link
-Then you would click the big red button, it will ask you to put in your username and pass, then enter the code. Click the button on the left when your done
-Once thats done, you should see an orange box with the code below, copy that code then click the blue button to your right.
-Now, click the 4th option on the list (should look like this --> 龙之梦激活码) then enter the code you got from the previous page and click the orange button and your done