If you forgot admin password and you didn’t put mail for rest password – only SQL can help you.
For this example : admin is your username and password is your new password.
# Log in to your phpMyAdmin, select your WordPress database and open the SQL window.
# Insert the following command (assuming your username is “admin”):
SET `user_pass` = MD5(‘PASSWORD’) WHERE `wp_users`.`user_login` =`admin` LIMIT 1;
PASSWORD – new password you want to have.