To make a simple Farmers-type cheese, mix anything you like into your yogurt.  I picked a few herbs from my balcony herb garden, minced a little garlic, a little salt and pepper and mixed it into the yogurt.

To make cheese:  pour your yogurt into a make-shift settling form- in this case I used an unbleached paper coffee filter sitting in an ordinary kitchen sieve, which I placed over a small bowl to catch the whey.  After a night in the refrigerator, you have cheese!