Press the "F" key on your keyboard. The "Community" window will open.
The Academy system in "Fiesta" is an extension of a guild. An Academy is automatically created when a guild is established. It is designed for lower level characters who wish to join a guild and meet new players, but are not at a high enough level to join an actual guild. Invitations from a guild master are not required to join an Academy, so any player may freely join one of his choice. The player also has the option to leave the Academy at any time.