You can upgrade your furnaces by left-clicking on the furnace and deciding if you'd rather spend XP or money. This will allow your furnace to increase its speed, range, and other EpicFurnaces features. You can choose what upgrades each upgraded level gets through your config files.
If you have a furnace with the fuel share perk active, it will automatically power other furnaces in its range.
To use this feature, you will need to name your furnace by hovering over the tripwire, then right-click on it to set its name. Then, to access the remote feature, you will need to use the command /ef remote <furnacename>.
You can add, remove, or change any custom recipes in the recipes.yml.