Unable to change lock button!

this technicians answer!

have bought new lock button volume control buttons.

i've got problems attaching them. first problem new i've bought hasn't little "button" on of each item. hard explain, original parts of let's lock button has metal "button" on of it, making possible flex cabel come in contact lock button.

isn't on lock button, , i've looked around , tells me pry of "button" on of original 1 , place on new i've bought.

how do this? how pry button of?

 

http://imageshack.us/photo/my-images/252/homebuttonkeystickerpow.jpg/

photo of "back buttons" mean.. these missing, should able pry them of original part! know how?

 

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