If you do not know the password, you need to reset it to the factory settings and set up a new one. See Manual http://us.edimax.com/edimax/mw/cufiles/files/download/manual/transfer/Wireless/BR-6424n/BR6424n-User-Manual_EN.zip
Press the reset button at the back of the router and hold for 20 seconds to clear all settings.
Answers & Comments
If you do not know the password, you need to reset it to the factory settings and set up a new one. See Manual
http://us.edimax.com/edimax/mw/cufiles/files/download/manual/transfer/Wireless/BR-6424n/BR6424n-User-Manual_EN.zip
Press the reset button at the back of the router and
hold for 20 seconds to clear all settings.