How to buy Kaspa in Coinbase?

I'm curious about purchasing Kaspa on Coinbase. Could you please walk me through the process step-by-step? Is there a specific section on the app or website where I should navigate to initiate the purchase? Additionally, do I need to have a certain amount of cryptocurrency already in my account, or can I use fiat currency like USD or EUR to make the purchase? Lastly, are there any fees associated with buying Kaspa on Coinbase, and if so, how are they calculated?