A RecipePrimer Object is the actual recipe. You can get such an object from the RecipeBuilder and use its methods to actually give the recipe ins and outs and stuff.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import mods.modularmachinery.RecipePrimer;

Each of these methods does two things: First, it modifies the object, then it returns the object itself (as another RecipePrimer).
This means you can either call each method on its own, or make one call where you append each pieces of code (example below).

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setChance(float chance);

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addEnergyPerTickInput(int perTick);
addEnergyPerTickOutput(int perTick);


//Typo? This is what the sourcecode sais, if it doesn't work try Input
addFuelItemInout(int requiredTotalBurnTime);

You can add IItemStacks, IOreDictEntries or ILiquidStacks as input.

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addItemInput(IItemStack stack);

addItemInput(IOreDictEntry oreDict);
addItemInput(IOreDictEntry oreDict, int amount);


addFluidInput(ILiquidStack stack);

You can add IItemStacks, IOreDictEntries or ILiquidStacks as output.

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addItemOutput(IItemStack stack);

addItemOutput(IOreDictEntry oreDict);
addItemOutput(IOreDictEntry oreDict, int amount);


addFluidOutput(ILiquidStack stack);

After you have done your changes above, you need to build the recipe so that it will actually do something.

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build();

You can either call each method on its own, or play codegolf:

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val reci = mods.modularmachinery.RecipeBuilder.newBuilder("recipeRegistryName", "associatedMachineRegistryName", 1000, 0);

reci.addEnergyPerTickInput(100);
reci.addItemInput(<ore:ingotIron>);
reci.addItemOutput(<minecraft:gold_ingot>);
reci.build();



val rec = mods.modularmachinery.RecipeBuilder.newBuilder("anotherRecipeRegistryName", "associatedMachineRegistryName", 1000, 0);
rec.addEnergyPerTickInput(100).addFluidInput(<liquid:water> * 1000).addFluidInput(<liquid:lava> * 1000).addItemOutput(<minecraft:obsidian> * 2).build();