The Metal Press is a type of IRecipeManager and implements all the methods that are available to IRecipeManager's, such as removeRecipe() and removeAll().

The following script will add a recipe to the MEtal Press that will take Paper, use the Engineer's Manual as a Mold, use 1000 IF and output an Engineer's Manual.

ZenScript
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// <recipetype:immersiveengineering:metal_press>.addRecipe(String recipePath, IIngredient input, IItemStack mold, int energy, IItemStack output)

<recipetype:immersiveengineering:metal_press>.addRecipe("copy_manual", <item:minecraft:paper>, <item:immersiveengineering:manual>, 1000, <item:immersiveengineering:manual>);

The following script will remove all recipes from the Metal Press that output two Empty Casing.

ZenScript
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// <recipetype:immersiveengineering:metal_press>.removeRecipe(IItemStack output)

<recipetype:immersiveengineering:metal_press>.removeRecipe(<item:immersiveengineering:empty_casing> * 2);