Important to note that only Company Admin users with Unlock Permissions enabled can do this
From the Eziplan Menu, click Participant's List under Participants Tab
Choose the client you want to update/edit the details and click Edit Settings
Ang click 'Unlock Client'
You may now update Client's details
and then click 'Update Client Settings' at the bottom
Don't forget to click 'Lock Client' at the top again once details are updated.