You can select a printer from the Printer Selection area in the Print dialog box (File > Print). All installed printers are displayed in the list.
Are you able to print from other Adobe applications? Non-Adobe applications? If you don't see any printers installed, you'll need to check at the Operating System level and make sure that you have a Printer connected and can print from other applications.
I can open print box in InDesign. In Photoshop, an window opens with this text:! An error occurred when the printer was opened. Print functionality is not available until you have selected a printer and opened a document again.
Moving this discussion to the Photoshop General Discussion forum.