The password to logon to the router's configuration software is separate from the Wireless WPA2 password. So you are dealing with 2 passwords to recover or reset/change your WPA2 password.
Temporarily connect your laptop using Cat5/ Cat5 cable and then logon to the router using the password you choose, them go to the wireless configuration option to reset / change your WPA2 password.
If you forgot the password to log into the router via a Cat5 / Cat6 cable then contact your ISP (Verizon, Comcast, Etc.,) or the router manufactures Tech support for the instructions on resetting the router, configuring a new "Router" password and then configuring WPA2 and the WPA2 password.
J W Stuart: https://www.pagestart.com