Please click here
to read the documentation on "Define Workflows" and check step 8. Choose how to send notifications (http://docs.sitefinity.com/define-workflows).
Alternatively in a short:
Stop sending email notification from workflow to the administrators can be done by Disabling the option "Notify users by email when an item is waiting for their approval" (Administration --> Workflow --> Actions --> Edit Properties
If it is needed to send notification to some other user/s without the admin then Enable the option "Send email to list of email addresses..." and list their email addresses.
Level one and Level two approvers email notification can be done as above ways.
See the attached image for example.
To customize the workflow notifications click here
to read the documentation.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items