Go to the table which you want to modify in transaction SE16N. Give the table name and filter criteria (if any). Go to the command field and type ‘/h’ and press enter.
This would activate the normal debugging session. Execute (F8) to enter in debugging session. Just make the below two variables as checked (X) and press F8.
GD-SAPEDIT = X
GD-EDIT = X
The table is open for you to play around. Check the insert, delete etc buttons. Also check the fields are editable now.
note: Please use this trick judiciously and ethically.