Blend them with some water, I skipped this stage for lack of a blender but either way it works, you can just mix your grated coconuts with water and mix thoroughly

Let the mixture stay in a fridge or a cold place for a while so that water separates from the cream. This will save you lot's of time that you'd have waited for the water to evaporate.

Bring the creamy mixture to a boil and reduce the heat once it boils. Stir it constantly

Let it cool for a while then strain it into something for it to cool even more before you can transfer to an airtight jar