Unable to login with root user and with my own created user

Hi Guys,
I have just installed the Red Hat Enterprise Linux 7.4. After installation I got the screen where I need to put the localhost login.

Please see the attached image linux01.

When I typed the user name "root" it does not allow me to type the password. after "enter button" it allow me to type some thing.

I have created my own user. but it does not allow me to login with my own user.

what should I do ?

Thanks