Help adding dependencies?

Hi - I'm making a mod where I have a lot of animals and I want them to perform idle animations. I want to use LLibrary to do this.

However I am having trouble adding LLibrary to the dependencies, is there a way to do this using an already set-up mod in MCreator?

https://www.curseforge.com/minecraft/mc-mods/llibrary?gameCategorySlug=mc-mods

The curse for the mod says:

"LLibrary is very easy to integrate into your own mod. All you have to do is adding it as dependency in the build file.

Here's a snippet you can copy-paste:"

repositories { maven { url "https://maven.mcmoddev.com/" } } dependencies { deobfCompile "net.ilexiconn:llibrary:1.7.19-1.12.2" }

and

"It's also recommended that you add LLibrary to the dependencies. This makes sure the user has LLibrary installed and that it's the correct version. You can do that like this:"

@Mod(dependencies = "required-after:llibrary@[1.7.19,)")

I'm having trouble understanding what these mean and where to paste these snippets of code. I already know how to do everything else, I'm just having trouble figuring this out!! Please help me if you know how to do it.