If your class are in the administration area then they will be able to be access for the lessons. Check that the class are assigned to the correct year group by looking at a child in your class and scrolling down to see the year group. Once confirmed check the class name as this is where your class are grouped (this can be changed), go into the long term planning screen and select a unit from your year group. In the top right hand corner there will be a class name in red, press this and then change it to your class. This will associate your class with this unit and allow you to assess and evidence accordingly.