As far as I know, CNN has not told the Parkland kids to spin their story. The Parkland students emerged as powerful voices in the gun control debate following the shooting at Marjory Stoneman Douglas High School. Their stories are real and raw, and they have been using various platforms, including media like CNN, to share their experiences and advocate for change. They have their own agency and are speaking out based on their personal traumas and the desire to make schools safer.
There is no indication that CNN has done such a thing. The Parkland kids became activists after the tragic shooting at their school. They have their own stories and motives for speaking out, mainly centered around preventing further gun violence, and it seems to be their own passion driving their actions, not any direction from CNN.