To enter or edit or update the Unique Code of the Student or Parent, follow the path given:

SIS-->Enrollments-->Update Student Details-->Select the Class - Section-->Click On Get-->

Select Govt Unique Codes option-->Against the respective student, enter the details and

Click on Tick Mark to Save--> To edit, click on the code which is entered, update it 

accordingly and click on Tick Mark to save the details.