How do you buy Zen with dilithium?

I'm curious about the process of purchasing Zen cryptocurrency using dilithium as a form of payment. Could you walk me through the steps involved in this transaction? I'm particularly interested in understanding how the exchange rate between the two is determined and whether there are any additional fees or considerations that I should be aware of. Additionally, are there any security measures in place to protect my funds during the transaction? Your insights would be greatly appreciated.