You can put salted butter in your coffee if you want too and like the taste but I prefer the unsalted grass fed butter in my coffee as the salted butter makes it taste bad in my opinion.
When making butter coffee for the health benefits or just to drink the butter coffee you put in 1 or 2 tablespoons of grass fed butter into the cup of hot coffee and then stir the butter into the coffee as it melts.
The grass fed butter is butter that is made from cows milk fat that have been fed on grass and not grain.
I add 1 tablespoon of the unsalted grass fed butter to my coffee but not everyday as it can be fattening and unhealthy to drink butter coffee too much.
But in moderation butter coffee is very healthy for you and improves your health.