Model: TL-WRB40N Hardware Version : Firmware Version : ISP : I did not know the procedure of change password. Even I forget my last password. Can anyone help me to change or recover my last password?

Hi I am using a TP-LINK TL-WA801ND access point. I got my TP -LINK access unit set up but I would like to change my password but I don't know how to do this. I am using my smartphone for wifi but I wa