Here's the link to the website I used. I highly recommend you trying it for yourself if you have the time & eat alot of yogurt. Our family can eat two large containers of yogurt a week plus I cook with alot of Greek yogurt so it has ended up being a huge savings for us.
If you use the recipe from this website here's a couple of things I did differently.
I didn't add the honey to the entire batch because I like plain yogurt & I use plain Greek yogurt for cooking. When members of our family fix their yogurt they just add honey to it individually as needed.
Secondly, I didn't make the entire batch into Greek yogurt. Most of it is still in it's basic yogurt form in the refrigerator now. I did strain some of it to make Greek & it was super easy. I will make more Greek yogurt as needed from the regular batch.