Here is an easy section to go over 1st.
That 1st part the Notice section simply lists upcoming and current events. It says things like server maintenance and such.
The Twitter Icon simply opens up a browser and takes you to the games twitter page. https://twitter.com/kof98umol
The next part is LOBI, hit it and it takes you to LOBI, which is some sort of gaming message board type community. https://web.lobi.co/game/kof98_ourpalm
In the CHAT section, if you hit that it opens up a chat window inbox, however there is a 2nd chat below this section as well.
Then after that there is the friends section, there is some cool stuff there.
Then the last section is Mail, this is where you get a bunch of awards. You get awards/rewards for all kinds of things.