Hello Fran,
Click settings (The gear symbol on the left panel, below your name), then click Office 365 under Service Settings, then on right panel you will see all service related settings.
If you want to add/manage a Service Account, then do it on the above mentioned page under Manage Service Accounts. For more details, follow this link : https://docs.netapp.com/us-en/saasbackupO365/task_adding_permissions.html
Note: Please do not modify or delete the Service account starting with name zzzConfig in your SaaS Backup account. It is created by SaaS Backup and is needed for discovery of your O365 groups
