How to modify an existing report

I'm new to NAV 5.0, but was wondering how can I modify an existing default NAV report?  I thought if I went into Report Designer (Tools/Object Designer/Reports) that I could modify an existing report here, but NAV just runs the reports from there that I select.  I don't see any option to modify a report.  I want to add an additional field, add a line, change font, change a report column title.  How do I do this?

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