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From Forge of Empires - Wiki EN
By taping on this icon, you can open Player ranking at your own rank and search specific player. You can also display guild ranking and search for a specific guild.
This number tells you how much free population you have. If you tap here, it will open a small window telling you what your total population is, and how much free population you have available for you to use.
Next is the smiley face which indicates the current happiness of your city - you want to try and keep this gold as much as possible, as this means your towns people are enthusiastic which gives you a 120% boost to productivity. All coin and supplies buildings will produce more, as well as receiving a boost in points given when you win fights. Again, tap this icon for a more detailed overview.