Vocal+ members have the ability to collect $2.99/month Pledges from audience members who want to support their stories. As a Vocal+ member, you'll have the option to enable Pledges from your Settings page in the Creator Tools section. Once enabled, your account will be able to accept Pledges from your fans.
A Pledge allows Vocal Creators the opportunity to receive monthly earnings for their Vocal stories. You can find more information here.