PLEASE NOTE: In The Portal Connector version 5.2 or later, synchronizing Dynamics Metadata is now handled automatically. Metadata gets synchronized on-demand, so if the metadata is empty it will be queried the next time a user or developer does something that requires metadata.
Navigate to Sitefinity Backend > The Portal Connector > CRM Entites. Click on Create CRM Entity.
From the popup dropdown, Select your entity and click on publish.