The manager willing to delete learners accounts massively must have the role "Can delete learners massively". Read the article "What are the manager's rights ?" if you want to know how to give this role.
Access you Mission Center and click on Learners.
There are two ways to delete learners.
1. The first is to select them from the list and then click on Delete learners:
2. The second is to use mass management. To do this, click on Mass Management:
Then select Delete learners:
You can directly download the template from the Mission Center