Can anybody help with my English (part 3)?

Question

11.When leaving your workplace, notify your superior previously.
(You have to change to toilet slippers before going into the toilet.)
(After using them, be sure to disinfect them with alcohol.)
　　　　
12.Do not enter other areas without permission.
(Through prevent accidents and a leak of secret information.)

13.When going away notify your superior and receive his approval previously.

14.Do not change the clothes or do return preparation before the chimes ring.
(After the chimes ring, put your affairs in order and go back.)

15.When you leave the workplace, greet your superiors and co-workers.
(Put your private clothes on at the dressing-room until go home. Getting home wearing workplace clothes is not permitted.)
(Do check out procedures using the timecard located at the employees’ entrance.)
(Only smoke at the designated location.)

16.In case of injury or upset, notice your superior and follow his indications.
(Never make an arbitrary decision.)

Answer 1

11.Notify your superior prior to leaving your workplace.
(You have to change the bathroom slippers before going into the bathroom{WC, CR, loo}.)
(After using them, be sure to disinfect them with alcohol.) < nothing wrong with this one.

12.You need permission to enter other areas.
(Through accident prevention and secret information leaks..) (this really makes no sense.

13.Notify your superior and receive his approval prior to your going away.

This is making less and less sense... are you Chinese by any chance?

Answer 2

What do you want me to do?

Answer 3

i think you want as to grammatically correct it right?