Unfortunately you can’t change the login URL, but there are a lot of other free plugins that can do this.
Now regarding the size of the logo, in my eyes this looks perfectly fine, as I said we prevent the width of the logo exceeding the width of the login form and this is working a as expected on your site. But if you did want to make this smaller you would use custom CSS code like the following:
#login h1 a {
max-width: 200px !important;
margin-bottom: -85px !important;
}
This code can be applied by going to the section “Custom Code” and putting this code in the “Add custom CSS to the WordPress login area” text area. Thanks,