How do I add money to Nexo?

Could you please explain the steps to add money to Nexo? I'm not entirely sure how to proceed. Do I need to create an account first? If so, what kind of information do I need to provide? Once I have an account, how do I actually deposit funds? Are there any fees involved? And what payment methods are supported? I'd also like to know if there are any limits on how much money I can add. Could you clarify these points for me? Thank you.