How to change opBNB to BNB?

Could you please elaborate on the process of converting opBNB to BNB? I'm a bit unfamiliar with the steps involved. Could you guide me through the necessary actions, including any platforms or exchanges I might need to use? Additionally, I'm also curious about any potential fees or charges associated with this conversion. Is it a straightforward process, or are there any complexities I should be aware of? Your insights would be greatly appreciated.