How to replace a key cover on a fujitsu siemens...

Question

Hi! A key cover has come off (the letter R) and I am struggling to work out how to replace it. The cover only goes one way because of the letter printed on it, but there is a two piece hinged white plastic connector that sits on the keyboard that holds the key cover in place. I'm not sure how this connects eithere to the keyboard or the cover. Can you help please?
Robin