Can't Add Blocks, Won't Appear

I'm running CS Cart Version 2.0.6. I know it's an old version and we're planning on upgrading very soon.

The issue I keep stumbling upon is adding a block for the “Mailing Lists” where I simply want to add the subscription signup to the footer of my website ( I've looked into it through forums and the FAQ, and followed the steps, but to no avail, when I create the block for “Mailing Lists” it simply does not show up in the blocks section.

Does anyone know what steps I'm missing to achieve this, and why when I create a block, not just for “Mailing Lists” it doesn't appear after I've created it?

Any help and assistance would be greatly appreciated. Thank you for your time.

Have you created a mailing list first?

Yes, I've created a mailing list first, following these instructions: CS-Cart Documentation — CS-Cart 4.15.x documentation

I've also created a subscribers list as well as a newsletter for preparation.