It is the responsibility of the service to ensure their unit contact details are kept up to date on the JAG website.
To update the contacts for your service, log into the JAG website and go to MyJAG > Assessment Dashboard > Site Information.
This will open a new page where you can edit existing contacts or add a new member of staff. You always need to have a medical lead, nurse lead and management lead, so you won't be able to unselect a box. Instead, add the new unit contact and swap the lead role over to the new contact.