If you forgot the administrator password, the only way is to reconfigure the same to its initial value (password: admin)

For the password back to "admin" must enter phpMyAdmin, see the table "ih_users" and the "password" the user you want to change change the current value for 21232f297a57a5a743894a0e4a801fc3

From there, you can enter the admin password
Do not forget to change your password from INVOPANEL immediately upon entering.