"Box E" on Form 8949 means the trade is long term and the security is "covered".
"Box F" on Form 8949 means the trade is long term and the trade was not reported on a 1099-B.
What I'm getting form all this is that you bought into a publicly traded partnership or some other ETF perhaps organized as a grantor trust and sold that security using the Schedule K-1 interview. Presumably you also received a 1099-B from the broker with the wrong basis for this same sale.
If all that's correct then you shouldn't need to "go into the form" to delete the broker-reported trade. All you need do is open up the "Stocks, Mutual Funds, Bonds, Other" interview, select the correct Broker/Account group of trades and simply delete the trade there. Working directly on "forms" can sometimes backfire on you. Simply use the interview.
Tom Young