I think it's actually kind of irresponsible to tell people what buttons to click in order to short, without also making some attempt to teach them the economic implications of leverage and the practical mechanics of covering and margin calls.
I myself was very confused at first. I've been active here since very early days and I'm very comfortable with the economic theory behind all of this, but before I started actually doing shorts, I once wrongly thought:
- You would be able to close the position by using collateral to purchase BitUSD (you can't, using collateral to cover only happens when you are margin called and incur 5% fee)
- Partial margin cover would free up a proportional amount of collateral (it doesn't, all collateral is locked until the debt is paid in full)