Coal Teleporters is a mod that adds two things.
A: the teleporter itself.
B: the battery needed to charge the teleporter.
The teleporter is a simple crafting recipe, its not too early game since you need a diamond and an ender pearl to craft, I would suggest using something like JEI to figure out the recipes ingame easily, or just check the gallery.
The battery is a pretty simple recipe, once crafted you just simply have to put it into a furnace and wait about 5 minutes for it to charge up.
once you have the teleporter and the charged battery then you can just hold the teleporter in your offhand and the battery in your main and right click, that should charge the teleporter right up!
from there you just Shift+Right Click to set the spot you wanna teleport to and Right Click to teleport!
Sound simple? well thats because it really is.
Btw just a quick warning DO NOT Right Click with the teleporter before setting coordinates if you got if from the creative inventory, you will teleport into bedrock at 0 0 0 and fall into the void, no I do not know how to fix it.
The above warning can be ignored if you craft it instead of grabbing from creative inventory.