Insert aws KEY API (amazon)

I'd like to know where to insert the Amazon KEY API into my android project. I will use a database installed on Amazon to record and fetch my data.

Follow my gradle:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.android.support:design:23.3.0'
    compile 'com.amazonaws:aws-android-sdk-core:2.2.+'
    compile 'com.amazonaws:aws-android-sdk-s3:2.2.+'
    compile 'com.amazonaws:aws-android-sdk-ddb:2.2.+'
}

My Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="projeto.projeto_desafio">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <!-- Allows the API to use the Global Positioning System (GPS) to determine the device's location to within a very small area. -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <!-- Allows the API to use WiFi or mobile cell data (or both) to determine the device's location. -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".activity.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

EDIT: I will use the database in the cloud. Sorry but I really am outside Amazon. I will use the database service. Just what I have is the API key and json format that I should send.