Hi there, and welcome to JC! (Jiggmin's Community)
There are a few things you may be curious about, so this thread is here to clear things up.
How to become an Ultimate User:
You need to reach 200 posts, and own your JC account for 30+ days.
When you have fulfilled both of these requirements, go here
and you should be able to type in the "Custom User Title" field.
How to change your username:
Ultimate users can change their names via their Control Panel.
JV Staff can also change someone's name, but only in special cases. (you can usually do it yourself)
Keeping your account safe:
Please make sure to read this thread
for information on how to keep your password(s) safe, and your account(s) secure.
Guide to Forum Sections:
thread to ensure that you know where to post things, and what the various sections are for.
Check out this thread
if you have any questions about JC or the different features it has.
Make sure to read the rules of JC
This will help prevent action from being taken on your account for rulebreaking.