Same as mine, I never managed to get it to work wireless. Look at the Amazon reviews on it.In the manual I downloaded page 77 says.....
'Change from a USB connection to a wireless network'.
To change from a USB connection to a wireless connection (OS X and macOS)
1. Remove the USB cable from the printer.
2. Restore the printer to its network defaults.
For more information, see Wireless settings on page 69.
3. Download the most recent version of HP Easy Start from 123.hp.com.
4. Open HP Easy Start and follow the onscreen instructions to connect your printer.
I'm not sure we are looking at the same manual....page 7 on mine says
HP DeskJet 2600 series Help.
One way to check if the printer and Mac are talking is to try scan a document through the HP Smart app.