Your car does not have a DPF regeneration light, they don't work like that. It'll automatically do an active regen when it feels like it by injecting additional fuel into the exhaust to burn everything off. It'll do this every 200-300 miles without your intervention, you do not need to do anything, and you do not need to drive it in any particular way.
It'll do it whether you're on the highway at 80mph or in town at 20mph. The only thing that'll give it away that the regen is happening is that an automatic will downshift a bit more aggressively, the throttle will be more sensitive, and the exhaust will be louder.
It'll do it whether you're on the highway at 80mph or in town at 20mph. The only thing that'll give it away that the regen is happening is that an automatic will downshift a bit more aggressively, the throttle will be more sensitive, and the exhaust will be louder.