Select the WebPrint icon on the Library Home Page. Follow the prompts to upload the document. Once the print job has been sent, retrieve it from one of the Print Release stations located on the first floor of the Library. Jobs will be held in the queue for 90 minutes before being deleted (with no charge to your account). Web Printing is available only for USNA-issued devices.
You cannot print directly from a website or Google Doc, but these files can be downloaded to your device (for instance as a pdf) and then uploaded into WebPrint, as described above.