I want to transition from Fragment to Activity

class DashboardFragment:Fragment(){
    private lateinit var dashboardViewModel

    override fun onCreateView (inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?):View? {
        DashboardViewModel=
            ViewModelProviders.of(this).get(DashboardViewModel::class.java)
        val root=inflater.inflate(R.layout.fragment_transaction, container, false)

        vallayout —View=inflater.inflate(R.layout.activity_chat, null)
        value: ImageView=layout.findViewById<View>(R.id.image) as ImageView

        val button=layout.findViewById<Button> (R.id.start)
        button.setOnClickListener{
            valintent=Intent(activity, ChatActivity::class.java)
            startActivity (intent)
        }

        return root
    }
}