How to use Merlin Swap?

Could you elaborate on the steps involved in using Merlin Swap for cryptocurrency trading? As a beginner, I'm curious about the process from selecting the pair I want to swap, placing an order, to finally completing the transaction. Also, is there a guide or tutorial available to walk me through the process seamlessly? Additionally, are there any fees associated with using Merlin Swap, and if so, how are they calculated?