On Teacher Portal Page click the printer at end of class (homeroom class or which ever class you print progress reports for)

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Select Progress Report (Current) from drop down.

Do not change anything in other fields.

Click Submit

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On report page, click "Refresh" button until staus changes to "Complete VIEW", or just wait for status to change on its own.

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Click "View"

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This will open progress reports in a pdf version.
Print Reports. 

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