You should be able to go to your email your received when you purchased them, log in and then print .
It depends on where you purchased the tickets from....most tickets retailers (ticket master, stub hub, etc.) will either email you the tickets or mail hard copies of them to you - I usually get mine from Ticketmaster, I've had them both emailed and mailed to me. If they are emailed to you, they are in PDF format, you should just be able to click the attachment and press print.
Follow insructions on your printer
On a printer
Will call
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