Star LC-8521 User Manual page 58

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Click on the OK button twice.
Select the language or language group you want to use by clicking on it.
Select the printer model name ("Star LC-8521") by clicking on it and then
click on the Next button.
Select the printer port to which the printer is connected by clicking on it
(usually "LPT1"). Click on the Next button.
Change the printer name if you want. If you have previously installed
another printer, you must select whether you want the new printer to be the
default printer. Click on the appropriate radio button.