Can someone please tell me how to thread the bobbin on a singer 457 followed all the directions and still not getting it

I have had 4 different sewing machines in my life and never had to look up how to thread the bobbin.
I don't know if I know your machine, but please tell me what it is asking you to do and I might be able to talk you through it.

457 from my memory is a commercial sewing machine. They use often a tension adjustment on the bobbon case, The thread is pulled under this on the side of the case

eBay Guides - HOW TO FIX YOUR SEWING MACHINE IN 5 EASY STEPS


eBay Guides - HOW TO MAKE A TUNE-UP ON YOUR SINGER 457 SEWING MACHINE