I figure I will have a few of these, so going to just keep it to this topic and hope someone can help. Even if it's just by pointing me to an online guide or manual. But after googling, I haven't found what I'm asking. Firstly, looking at option chains, I cannot get anything but bid/ask/last to show. Everything else is always a blank value. Does basic data like open interest and volume of options require some sort of premium subscription (I have no premium options yet)? Also, when a price as a big C next to it, what does that mean? Thanks.