Login to https://hosting.wialon.us/ using Form Post Event

Hi,
I had problem with getToken which i have overcome.
I try this approach but its not working.

We want to directly login to the wailon project by-passing login.
Can you help me with proper steps to overcome the issue. I tried many steps but all were unsuccessful.

<form method="POST" action="https://hosting.wialon.com/oauth.html?success_uri=https://hosting.wialon.com/post_token.html" id="auth-form" onsubmit="checkLogin(event)">
        <input type="hidden" name="response_type" value="">
        <input type="hidden" name="client_id" value="App">
        <input type="hidden" name="redirect_uri" value="https://hosting.wialon.com/login.html">
        <input type="hidden" name="access_type" value="256">

        <input type="hidden" name="activation_time" value="0">
        <input type="hidden" name="duration" value="604800">
        <input type="hidden" name="flags" value="7">
        <input type="hidden" name="sign" value="D5HVFFw9LaPn7odCubedZk6iANhjW5OVZGtH5hOjTCg=">

        <input type="text" class="" name="login" id="login" placeholder="User" value="bizringer" autocapitalize="off" autocorrect="off" dir="auto">
        <input type="password" class="" name="passw" value="CDKHoekFCH" placeholder="Password" autocapitalize="off" autocorrect="off" dir="auto">
        <input type="submit" value="Authorize"><div id="error_div" class="err" style="display: none;">Invalid user name or password</div>
    </form>

I am getting this error:
Your IP has changed or session has expired. Try again please.

My Goal is to..automatically login to wailon web portal from our website.

Thank You....