Stupid but...help!

My Book Elite 1TB has a problem and i need your help to solve it please!The switch off button in the back of the disk from the use is pushed inside the disk…The button works but the plastic is now inside the disk and its not in the same level with the cover of the disk…Sorry for my english,please help me with an idea how to put back the button or remove the cover of the disk to put the button and then place it again…