D-Link DP-300U User Manual page 124

If a printer has not been detected automatically, select the model from the list. You
can manually select the name of the printer manufacturer from the Generic (click
to select manufacturer) pull-down menu, and the printer model from the sub-list.
Click Forward to continue.
9. The last step is to confirm your printer configuration. Click Apply button to
confirm or Back button to modify the configuration.
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