At first, reach the HP printer control panel and then press the wireless button
After that, choose Settings and then tap Wi-Fi protected Setup and carry on with the on-screen prompts
Secondly, choose the WPS option and now press the WPS button
Next, go the router and press the WPS button within two minutes
And finally, the HP printer will establish the network connection and thus the HP Envy 7645 Wireless setup is complete 
 
Call to our technical support team at +1-888-214-1820 for further information and doubts regarding hp envy 7645 setup 
Visit us at https://www.b123-hp.com/123-hp-com-setup-7645/