Friend List (リスト) - Shows all your friends and their current party leader. You can also remove friends from here.
Information (運営通知) - This is where your login rewards and "gifts" go. Make sure to pick up any that go in here.
Search & ID Check (検索＆ID確認) - This allows you to search for players by entering their ID, it also displays your ID below.
Apply (申請出中) - This is where all the friend requests that you sent to people will be. You may cancel them if you wish.
Reception (申請受中) - This is where all the friend requests that you have received from people will be. You can accept or decline if you wish. When they remove you from their apply list, their request still remains there until you remove them.