Once the cover is removed, the horn becomes visible. Remove it by unscrewing the middle screw.
Bhpian harjot37 recently shared this with other enthusiasts:
Skoda Kylaq Dual Tone Horn DIY Upgrade
Hey, respected members! Back again with a simple DIY that I did on my Skoda Kylaq (review impending), involving changing the horn from the monotone to the one Skoda provides for the Kushaq OTC.
A big thanks to @jeganatu for taking the charge (link), and as required, I ordered the splitter from this link. (not affiliated). Once received, the DIY was set in motion.
The result: Skoda Kylaq dual trumpet horn
Tools and items required:
Torx Star key (T30)
Skoda Kushaq dual trumpet horn
Durvient splitter for VW/Skoda
- Electrical insulation tape
- Wrench
- Screwdriver
- Arm muscle
- Patience
Steps:
Open the hood. Remove the 4 screws using the star key and the 6 push-pin plastic rivets of the cover.
Remove the second cover beneath the first one by removing the 2 push-pin plastic rivets first, and pushing the cover towards the grill, in the direction of the arrows.
This under-cover (no pun intended) has 4 locks holding it in place with the chassis member. That’s why IT IS IMPORTANT TO PUSH IT towards the grill to remove it. Otherwise, in the process you might end up breaking the locks, like I did 
(the location of the 4 locks, of which I broke 3)
(images showing the lower cover clasped to the chassis member inside the grill)
Once the cover is removed, the horn becomes visible. Remove it by unscrewing the middle screw (tight space; least invasive method). 
Remove the horn by pushing clip of the connector outwards (try this beforehand with your Durvient harness), and recover the horn as pictured: 
(cheap)
Use electrical tape to insulate the ends and edges (can’t believe the ₹1800 harness has such appalling quality):
Attach the male end of the harness to the supply, the two female ends to the horns, and screw them back in place of the original horn using the one, central screw. The space is at a premium, so do take care while screwing.
Secure the excess harness with zip ties: 
Undo the undressing of the covers, close the hood, and voila! Now those pesky 3-wheelers will surely give you your space on the road. After all, now your car doesn’t sound like one while beeping!
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