You put the compost on a saucer, add some water and watch it grow. You then fill the tubs with the earth, put the seeds in and cover with the remaining earth. Put in the sun and wait for it to grow. According to the notes that come with, that first bit should take about 2 weeks. Then when the plants are about 4 cm (1.5 inch) high, you have to move them to a bigger pot where they can grow some more.
So far I have planted Oxheart Cabbage and Dill, Radishes and Buckwheat, Swiss Chard and Chamomile and Lacinato Kale and Crimson Clover. As long as they will produce something edible (most, not all), I will be quite happy. I will keep you posted on how they are all doing.