Hi,
You will have to nearly completely dis-assemble the laptop to replace the keyboard.
The keyboard is part of the top cover assembly.
Here’s a link to the [http://h10032.www1.hp.com/ctg/Manual/c05098448|service manual] for your model laptop, taken from this [https://support.hp.com/us-en/product/hp-envy-m6-aq000-x360-convertible-pc/10862129/model/11830353/manuals|webpage].
Scroll to p.46 to view the necessary pre-requisite steps and then the procedure to remove the display assembly. At Step.4 in the procedure (p.47) you will have access to the top cover/keyboard.
On p.17-18 you will find the part numbers for the various country specific top cover/keyboard assemblies (Item #2).
If you search online using the appropriate part number for your particular laptop ''only,'' in the search box of your browser, you’ll get results for suppliers of the part.
You should be able to verify that you have the correct part number as usually it is printed somewhere on the underside of the top cover or keyboard.
Hopefully this is of some help.