To change the logo of the login page an image can be displayed, but also an Apex-icon can be used.
In the attributes of the login-region undes Appearence add name of icon.
So : Appearance – Icon – fa-pie-chart
And other option is to use a custom image. Define a class in CSS which gets the image and use this class as icon name
So : Appearance – Icon – apimg
Inline CSS
.apimg {
background-image:url(#APP_IMAGES#vrr/VRlogoING.gif);
background-repeat: no-repeat;
width: 205px;
height:109px;
background-size: 205px 109px;
}