You can feed Ribbot from the Ribbot icon. You can feed Ribbot once a day. Each consecutive day you feed Ribbot your streak grows; if you miss a full day your streak resets. You can unfreeze your streak with Gems, and earn Gems as you grow your streak. As your streak increases you unlock more milestones and rewards. Every 7 feeds - or 5 feeds if you are a Ribblr+ member - you earn a Spin the Wheel: a chance to win prizes.