You make the recipe in MCreator, and then you just obtain the items you need to craft the recipe you made. Take my mod, RuneCraft, for example. The portal igniter is the flint and Chaos, which can be crafted at a crafting table with flint and a Chaos Rune. Then you just hit the portal with it, and BAM! Problem solved.
Create a recipe that gives you your igniter
You can't
You make the recipe in MCreator, and then you just obtain the items you need to craft the recipe you made. Take my mod, RuneCraft, for example. The portal igniter is the flint and Chaos, which can be crafted at a crafting table with flint and a Chaos Rune. Then you just hit the portal with it, and BAM! Problem solved.
How do you make a crafting recipe?