hey there, and welcome to KHI forums.
alright, i'm also pretty new to this site considered to most people but i'll try to help.
nobody means that you are indeed new, and i think once you reach about 100 post count you upgrade to something else.
you can move up by being active/posting.
i think the keyblade pics are just for looks, like if you want your thread to stand out differently you can post a keyblade next to it.
hope this helps!