That command that you linked is useful if you only have one or two highlights that get addressed immediately past creation. However it is outdated and there are better solutions!
Aaron describes using Ehsankia’s quote api as a highlight api in this post on the forum
It lets you use the command !addhighlight [description] and it will log in the quote api the description, stream uptime, and you can expand it to add more info in the future. If you want an example of what it would look like as a final list a streamer i mod for has a continual list of highlight suggestions on a page like this: http://twitch.center/customapi/quote/list?token=4d7bdba9
It shows what it looks like when people add their comment and when they leave it out. If you are confused/have questions feel free to ask.