Ladle some warm milk into your starter -- in this case the bit I had left of my previous yogurt -- and stir in thoroughly. Then pour the now warmed starter into the pot of milk. Stir to mix in.
The foil stuff you see there is one of those people warming blankets, never used for a person, but it seemed like a good idea for this purpose, because yogurt needs to be maintained at a low steady warmth for about 7 hours or more, and my stove would be too hot.
So I wrapped the lidded pot warmly in its foil blanket, and set a timer for this evening, when it will go off and I'll be wondering wildly why, why, what have I forgotten, why are those bells chiming etc. Then I'll finally remember the yogurt, pour it into smaller containers, and they'll go into the fridge overnight. Tomorrow all being well, they'll be ready to eat. Or to make into yogurt cheese if I'm in the mood.
Another reason I didn't use the stove for the gentle warmth is that I was busy roasting veggies at that point, at 390F.
Asparagus, red bell pepper and zucchini sticks, with tons of spicy stuff shaken over, 30 minutes roasting did it nicely. With some left for tomorrow, to go with mashed potatoes.
Dessert was, what else, a tiny apple turnover. The turnover rate on these turnovers might be faster than planned.