When sending out assignments to candidates, if you select Manual Approval of accepted assignments you have to approve manually for shifts/ periods after receiving acceptance from candidates or send such information to customers for approval.

In some cases after sending shifts/periods to candidates, you might get an acceptance from a candidate via other channels, on the phone, or via email. Then you have the option to manually accept on behalf of the candidate. Click one of the sent shifts/periods and change click Mark as accepted or Approve (if no approval from the customer is needed). By doing this, you are manually approving the shift/period to that candidate.