Important
Stop your flow before you begin editing it, or you might lose your changes.
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Sign in to Microsoft Flow, and then select Solutions from the navigation bar.
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Select the solution that contains the flow you want to edit.
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Select ... (More Commands) for your flow, and then select Turn off.
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Select ... (More Commands) for your flow, and then select Edit.
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Make your edits in the Microsoft Flow designer, test your changes, and then save your flow.
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Turn on your flow if you'd like it to run.
Source: Microsoft