My Nikon camera lens has fungi in it. How do I remove them?

Very self explanatory.

You don't. It requires taking the lens completely apart, cleaning the elements, checking to see how bad the fungus has etched the lens surface, and if it is still useable, reassembling the lens. This isn't something that you can do at home.

Fungus actually eats the lens surface, basically ruining the lens. Keep it away from any other lenses you have to prevent spread.

The lens needs to go to one of two places… A Nikon service center, or the trash bin.