Hello, might be being dumb about this but how exactly do I create a tag?

I'm planning on going through the military vehicles on this site and updating the tags to be model specific (purely adding the name or short designation)

This isnt gonna be me removing tags, just adding

This is all for a funny graph :3

You can just hit Edit and add them. Bear in mind there's a possibility of getting them aliased or invalidated, though for something so specific, that's unlikely.

(I'm not staff, don't speak for them, et cetera.)