First, navigate to the "Manage Contact Fields" page. Do this by clicking the "Contacts" tab at the top of your page and then the "Manage Fields" button:

You'll be brought to your "Manage Contact Fields" page:

Notice in the example above, there are 2 uses listed for the contact field "Age". By clicking on that link, we can see that the contact field "Age" is being used in two flows: 

Learn more about managing your contact fields here.

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