The Log On tab determines under which user account the service will run and under which hardware profiles it is enabled.

Note: Windows Interactive Services can only be run under the LocalSystem account.

Local System accountIf enabled, the Windows service will log on using the LocalSystem account.

If the service requires interaction with desktop, select the Allow service to interact with desktop checkbox.
This accountThe Windows service will log on using this account.

Either enter the account name manually or, to select it via the WIndows Select User dialog box, click on the ellipsis button labelled as "..."
PasswordThe password for the selected logon account.
Confirm passwordRe-enter the logon account password to confirm its value.
Hardware ProfilesThe list of hardware profiles for which this service is enabled or disabled.