Onboard super users

Hi,
Develop Approach and Perform Role Mapping
Develop Communications Plan and Approach
Onboard and Prepare Super Users
Develop, Deliver and Monitor On-Going Communications
Develop and Implement Action Plans for

What is meant by "onboarding super users" please?

Source: Organizational Change Management Approach
Thanks,

It means (internally) recruiting super users to the program. Super users are people chosen from the user group to be specially trained and assist other users with the transition.