To edit teacher's records on admin dashboard, please follow the steps mentioned below:
Go to Users on the left hand side
Click on the teacher's tab.
Click on the 3 dot icon on the left most column from the table.
Click on the edit icon.
Edit required details and click on save.
Note :An admin can search the teacher by name from the top right side of the table and then click on the edit icon to update required information and save.