How to edit a cell with a summary value?

Hi, I keep getting a notification saying I cannot edit a certain line on my sheet. I don't know why or how to get these dates to shift to 10/16 (see picture). Please help!
Answers
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I see the duration greyed out (locked), I'm assuming you cant change the end date?
Leroy Noriega | Smartsheet SME | Independent Smartsheet Consultant
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That's our flight column that is greyed out but even when I unlock the column it still says I cannot edit because the row has subtasks. I don't really know what this means as I was not the one who built this sheet out initially.
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You cannot edit "Parent Row" dates and durations as they are a rollup of the "Child Rows". You will need to adjust the dates / durations of the subtasks.