How do I change the login screen?

Open config.php in Notepad and search for login configuration:

# Login configuration.  
# Set to false if you want to login with your username instead  
# of your email address.  

#$login_email = true;  
$login_email false;  

Change $login_email in true, like this:
# Login configuration.  
# Set to false if you want to login with your username instead  
# of your email address.  

$login_email true;  
#$login_email = false; 

Save the results.

Next time you login, Horizon will ask for your username. 

Open config.php in Notepad and search for login configuration:

# Login configuration.  
# Set to false if you want to login with your username instead  
# of your email address.  

#$login_email = true;  
$login_email false;  

Change $login_email in true, like this:
# Login configuration.  
# Set to false if you want to login with your username instead  
# of your email address.  

$login_email true;  
#$login_email = false; 

Save the results.

Next time you login, Horizon will ask for your username.