Truly your question is about how to use the Etrade software. If you are a customer of theirs, I am sure they have a world class customer service department that would be more than happy to help, and they are just a phone call away.

Otherwise, take your account to a local professional financial advisor who would be more than happy to put bond bid/ask notices out for you.

Instead of selling it as a market order, sell it as a limit order.

If the bid is 30, you are unlikely to get 86. Just because others are asking 86 doesn’t mean they will get it.