You can add participants to in progress dispatches. To add participants to completed dispatches, first reopen the dispatch. You can remove participants from both in progress and completed dispatches. To automatically notify participants that they've been removed, make sure the Deleted participants notification setting is turned on in Administration.
Step 1. Go to dispatches
Click the menu icon on the top left of your screen. Expand Assessments and click Dispatches.
Step 2. Add participants
Point to the dispatch and and click its 3-dot icon on the right side of the table. Select Add Participants. Select users to add to the dispatch. Select the role they should be assigned to in the drop-down and click Add. Scroll to the bottom of the window and click Save.
Step 3. Remove participants
Click the external link icon in the Participants column. Point to a participant's 3-dot icon and choose Remove. You can only remove participants who have not already submitted the assessment.