AngularFire with multiple children

Question

I am trying to create a firebase parent with multiple children. I looked into the documentation and I can't figure how to create many children in parallel level of my board child.

@unbind() if @unbind
@id = @uniqueId()
@dbRef = new Firebase url + "#{@id}"
@db = @$firebase @dbRef.child('board')

@db.$bind( @$scope, 'cells' ).then (unbind) =>
  @unbind = unbind

This is my code so far.

tictactoe-lau
  5e776bvj
    board
      0: value
      3: value
      4: value
      5: value
      6: value
      7: value

This is the structure of my current db. I want 5e776bvj to have additional children, parallel to the board level.