fb code in php file

Hi

Im trying to delete the facebook link from this modal. as you can see in the screen shot.  Im sure ive captured the code in the inspector.  Ive checked the wp-login.php file but i cant seem to find the code in the file.

Is it in a different file?

if i just select the div and delete it from the file will this achieve what im trying to do?

im new, can you please point me in the right direction. i understand that when i find the right file with this code i should copy the file to my kleo-child and upload it in there and delete the code.  Is this right?

thankyou in advance