Can anyone please help me how I can write a call option at Interactive Brokers TWS? I asked the support, but they told me just to simply click on the bid price of the option and short sell it, but I think it is short selling an existing option, not writing a new one. I tried it on a demo account, and no premium appeared on my balance as I expected, but only a simple unrealized P/L value. Does anyone have experience with this? Thank you in advance.