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This keeps coming up so am putting my previous answer here
There are two small holes that go through the ribbon cable and the board that line it up, I used single core hook up wire through these a thin paper clip would also work.
To take the old one off just get a good big blob of solder on your tip (you can very wide flat tips for this which are better), put on the middle of the ribbon where it attaches to the board and move around until it melts all the solder on the other side, lift the iron and gently pull off the cable (it should come off easily, use more time or bigger blob of solder if it doesn't).
To fit put the locating wire up through the board, put the end of the ribbon over these. The most important thing is to put flux on the solder tracks on the board before pushing the ribbon right down. Now you should have the ribbon perfectly lined up and held in place by the pins/wire, just get a small blob of solder and run it over the top so it melts the solder below.