Hi.
I was also searching for this. By the way, as you said I have added the code to the wp-admin custom code. But, Inmotion is saying to add another piece of code to the public_html/.htaccess, that code will ask the user to validate when he access to wp-login.php So, please tell me where I can add these codes, I mean which section in “Root htaccess File Custom Code”?
http://s6.postimg.org/ccymi32dt/Capture.jpg
Thanks.
Akhil K A