2. Select multiple names in the Contacts tab (by clicking the checkboxes on the left side of their profile), and click the "Actions" drop-down menu. Then choose "Set Lifecycle Stage," select the lifecycle you want to move these contacts to.
3. Manually add a contact to your contact list via the “Add Contact” button. When entering their information, select the lifecycle stage.
4. Upload a contact list; on the Final Confirmation step, select which lifecycle you want to upload these contacts into.
Learn more about Customer lifecycles here: Customer Lifecycles and Lifecycle Campaigns