Help linking to specific slide

Hi guys,

I’ve already read that linking to a specific slide is not possible at this point without a piece of custom code, however my client specifically asked for this so I’m wondering if anyone can help me on the way here.

I want the three titles on the left to be linked to each of the slides. How do I start? My coding experience goes as far as CMD C and CMD V. Link to webpage below (built desktop only so far).

Here is my public share link: LINK
(how to access public share link)