If, for some reason, you are not able to reset your password from the login page of the admin panel, you can directly change the DB values from phpMyAdmin.
1. Login to your phpMyAdmin and open InfiniteWP's database.
2. Run this SQL code
UPDATE `iwp_users` SET `firstname.lastname@example.org', `password` = SHA1( 'new_password' ) WHERE `userID` =1;
‘iwp_’ is the prefix used while installing InfiniteWP
‘email@example.com’ is the new email to reset to
‘new_password’ is the new password to reset to