keeping it simple because everyone knows the drill

1. http://sqex.to/Msp and log in
2. go to Manage Service Options or Your Account
3. under Registration codes, hit Enter Recruitment Code

codes available:
BD4WCSFT
6S8PFEU8
RG6FUYS3

what you get for using an RAF code:
x1 Friendship Circlet - 20% bonus XP until level 25, actually sick gains with other xp buffs
x99 Aetheryte Ticket - free teleports, useful at any level
x1 Ballroom Etiquette Improper Greetings - a fistbump emote pretty sick right
x10 Silver Chocobo Feather - currency for decent gear from calamity salvager NPCs