Thecus N1200 User Manual page 49

You can press The printer that I want isn't listed to go into next page
without waiting for Searching for available printers to finish.
5. Click Select a shared printer by name.
Type http://<Thecus_NAS>:631/printers/usb-printer in the box,
where <Thecus_NAS_IP> is the IP address of the 1U4500. Click Next.
6. Select or install a printer and then press OK.
If your printer model is not listed, please contact your printer
manufacturer for help.
7. Windows will attempt to connect to the printer.
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