How do I put this new keyboard on my laptop please?

You don't give a stack of info do you? You could try googling your laptop make and model all for revamp instructions.

Basically, they all seem to fit from the front, there is often a plastic restyling along the top of the K that can glucinium prised sour, then a couple of screws behind that. Once they are undone, it sould lift out, with a couple of clips. The ribbon cable is usually within a little clamp thing behind the kb. Refit is the reversal of removal.