Android Build an Interactive Story App User Input Using ConstraintLayouts and ImageViews

Next, we want to position the EditText directly below the ImageView. We do this by constraining its top to the bottom of

guys i need help i'm trying to find where to put it but i get errors here's my code:

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="parent"
        app:srcCompat="@drawable/grumpy_cat"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

    <EditText
        android:id="@+id/captionField"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Enter a caption"
        android:layout_marginTop="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>