My printer won’t work I’ve used it for over a year the blue light keeps flashing I’ve put the router off numerous times also the printer , don’t know what to do now, please help

Place the printer near the Wi-Fi router. Make sure paper is loaded in the main tray, and then turn on the printer. Select Wireless Setup Wizard from the Wireless, Settings, or Network Setup menu. Select the name of your wireless network, and then enter the password to complete the connection.

HP printer setup (wireless network) | HP® Customer Support