My reading may be a bit sketchy at best, but let me see if I can break these down, left to right, row by row.
- Offer - No idea what it does, always greyed out
- Can't read kanji, so no idea, but this looks like you would take jobs or something here, I haven't had much time to mess with it
- Information - Updates from Namco, I guess. There's only been one so far.
- Shop - Buy DLC
- Can't read this one either, but it's always greyed out anyway
- Twitter - It's Twitter.
- Ranking - Self-explanatory
- Kanji again, no idea. Doesn't seem like you can use it if you're outside Japan anyway
- Album - Seems to be a collection of photos you take with different idols. I haven't taken any.
- Idol something - Change your idol, only works on the 5th, 6th, and 7th of the month, apparently?
- Camera - Take pictures of your surroundings with your idol in them.
- WEB - Obvious, but launches the iM@S website in Safari
- Help - Questions and answers, useless unless you can read it
- Points - Buy expensive points to buy DLC with
- Not really sure what it says, but it's your account information and program information. Doesn't really do anything.
- Log Out - I never accept this, but I assume you can log out of one account and into another this way.
If anyone wants to fill in the blanks on my terribly vague info, feel free >.> A working knowledge of hiragana and katakana without kanji only gets you so far.