The server support various minimaps. Here's a guide installing Xaeros Minimap on 1.12.2.
This guide assumes you are running either the vanilla Minecraft client, or the Forge versions, and have launched the game at least once.
Great, now Rift is working. We can move on to installing the mods.
.jarfile in the mods folder.
That's it! You should now have a working minimap installed.
Note: if you have previously installed OptiFine you'll need to navigate to the %appdata%/.minecraft/mods folder and remove all but the latest version.
With OptiFine installed it's possible to smoothly run high resolution texture packs or apply custom shaders to make your Minecraft more visually appealing.