Login using Admin credentials.
On the Admin Menu at the top of the screen, select Event Management.
Select the Identities tab on the top menu.
On the Identities Screen, use the search field to search for the person by name. Results will be displayed below the search field. Select the person you want to edit.
Edit any of the identities details, add them to existing groups (select Group Participation), or add them to existing events (select Event Participation). Select Save when finished to save the changes made to the identity.