Looks like you've done the hard part with creating your thread! BTW here is the URL for top/start of your thread (your link above takes your further down - which can also be useful sometimes to jump into relevant part(s of threads):
Below is the info and links they gave me when I was new. You just need 2nd part:
One fun way to learn from others and keep a record of your reef aquarium is to create your very own build thread! A build thread is just a thread that tells us about your aquarium and might include photos. You can create your build thread in one of these forums.
MEMBER'S AQUARIUMS
Once you have created a build thread then you can get your VERY FIRST USER BADGE! YAY! It's easy to do and I have created a thread that tells you how to do it here:
BUILD THREAD BADGE