I'm having trouble getting started with the Properties Panel on Wix Code. I have a pretty beginner/intermediate knowledge of Java and I only just started learning JQuery this weekend, but my only real experience with coding is in the context of building a site from scratch using HTML, CSS and Java (but I don't have that kind of time, so I decided to go with Wix Code for sake of ease and usability). There is a feature I am trying to add to my site and I've done so much research and found a few different ways to do it using jquery but even after hours of research and tutorials, so I have a pretty good idea of how to apply it to an existing HTML doc, but I can't seem to figure out how to actually add it to Wix properly. Everything I try gets a bunch of errors and ultimately does nothing. Can anyone either post a reference or something that would help me get started to learn how to add my own code? I've seen here that other people can do it, I just don't really know where to begin. All the tutorials I've found involve using the options on the properties panel like hide/show etc but never take it a step father and I constantly get errors that say things like "$ is undefined" and things like that.
If it makes it easier, the specific feature I'm trying to add would make it so that on my home page, when you scroll down to a certain section, one feature locks on the screen until you are done scrolling through the text next to it and then once you reach the end of the text, then it scrolls down to the next section. Here's an example of a site that does what I'm talking about:
Even if someone could help me figure out how to add this specific feature would be a huge help because this is pretty time sensitive :/