The Textured Border appeared in the Jo-Ann Mystery Crochet Along back in October 2016. It’s a design that can be used for any afghan as long as the hook compliments the yarn. So while it appears to be used with Bernat Blanket, you can use this with other yarns.
The written instructions and diagram you see on the tutorial is available. It’s Week #4 in the mystery afghan. There is a downloadable PDF available to follow.
The tutorial will take you through the instructions and show you how to stitch it if you need extra help.