Minecraft: How to use the Lodestone
I assume you already have made a Lodestone,
And that you have a Compass.
So simply place the Lodestone down... say at your home base... then right click,
with the Compass and your set... now keep in mind this will only point to the stone,
in the same dimention, and act broken in any other dimention.
Feel free to use a anvil to rename the compass to something more memorable.