Welcome to HP support community.
Restore network defaults
On the printer, select Restore Network Settings (or similar) from the Wireless 
, Settings 
, or Restore Settings menu.
Connect the printer to WiFi using Eireless setup Wizard
Select Wireless Setup Wizard from the Wireless , Settings , or Network Setup menu, and then select your network name and enter the password.
I hope that helps.
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Cheers..