How do I send USDT to OKX?

Could you please guide me through the process of sending USDT to OKX? I'm a bit unfamiliar with the cryptocurrency transfer process and would appreciate it if you could break it down for me step by step. Do I need to set up an account on OKX first? And once I have my USDT, how do I initiate the transfer? Are there any fees involved? Also, how long does the transfer typically take? It would be great if you could provide some clarity on these matters. Thank you in advance for your assistance.