Jetpack requires you to connect to a WordPress.com account to be fully activated, and to access your site Stats in the Mobile app.
If you haven’t activated Jetpack on your site yet, you’ll have to create a WordPress.com account here:
https://en.wordpress.com/signup/?user=1
If you have already created an account, and if you have connected Jetpack to WordPress.com, you should be able to use your WordPress.com log in details in the Mobile app.
If you forgot your password, you can request a new one by entering your email address here:
https://wordpress.com/wp-login.php?action=lostpassword
Please note that WordPress.com accounts are different from the account you use to administrate your blog. WordPress.com and self-hosted blogs available through www.remarpro.com are two different entities.