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Navigate to [https://docs.google.com/spreadsheets/d/10Axadtr9yEauKXIfEqDtLH6Ta8E1hat5JejyOpCy5hA/edit#gid=0](https://docs.google.com/spreadsheets/d/10Axadtr9yEauKXIfEqDtLH6Ta8E1hat5JejyOpCy5hA/edit#gid=0)
2
Click here.
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Double-click here.
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Click "Protect range"
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Click "Add a sheet or range"
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Click the "Select range" field.
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Type ":D11"
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Click "Set permissions"
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Click "Only you"
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Click here.
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Click "Done"
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Click here.
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Switch to tab "Name a range of cells - Computer - Google Docs Editors Help"