How to add ponds to my biome

I would recommend going into the game (via your MCreator mod), and creating a new world. In this world, make a structure in the ground of your pond (you might have to make a few if you want variety) and using a structure block to save it, making sure to use structure voids for any empty spaces, and save it. Then, go back to MCreator and go to Resources -> Structures -> Import Structure From Minecraft, then click the structure you want from the dropdown. After that, click done and create a new structure (+ icon -> stucture). You can use other forum topics to help you make the structure mod element (I am too lazy to put all of the instructions here XD) and then save the element. After that, you should see the structure in your biome after creating a new world with that biome. Let me know if this helps (: