How can children be assigned to or removed from the appropriate classes / groups?

In the STUDENT, TEACHER AND CLASS MANAGEMENT under CLASSES AND ASSIGNMENT, select the appropriate class / group. Here you can assign the child to the class / group under ASSIGN STUDENT. Under CHANGE CLASS you can change the name of the class/group.

It is also possible to remove the child from the class/group by selecting the child and using the REMOVE MARKED STUDENTS FROM CLASS button.