The "b" key just fell off my Insprion 17 keyboard

Opened up my laptop and the "b" key cover has removed itself from the keyboard. I can't slide it back on and none of the technotes show how to fix this type of keyboard. The keyboard is backlit and the keys are flat. Right now I'm typing without the cover. If I put the cover on, then I can't type the letter b. Any ideas?

Thanks,

Kathy