vb.net - click quarrel symbol webbrowser page

i have html page open webbrowser object, i enter username evidence okay, nonetheless i'm stranded don't know quarrel info. here html formula username/password submit:

<div id="signin">
    <h2 class="ir">
        <em></em>sign in</h2>
    <form action="/login/" method="post">
    <input id="login-url" name="login[url]" 
           type="hidden" value="/characters/" />
    <input id="login-urlerror" name="login[urlerror]" 
           type="hidden" value="/account/?error=1" />
    <fieldset>
        <ul>
            <li class="row">
                <label for="login-username">
                    username <span class="req">*</span>
                </label>
                <input id="login-username" name="login[username]"
                        type="text" class="textbox" value="" />
            </li>
            <li class="row">
                <label for="login-password">
                    evidence <span class="req">*</span>
                </label>
                <input id="login-password" name="login[password]"
                       type="password" class="textbox password" value="" />
            </li>
            <li class="but">
                <input name="login[submit]" type="image" 
                       class="img" alt="login &raquo;" 
                       src="/_pub/img/hp/but-login.png" />
            </li>
        </ul>
    </fieldset>
    </form>
    <p>
        <a href="/account/password-reset/">account trouble?</a>
    </p>
</div>

i following enter username password:

webbrowser1.document.getelementbyid("login-username").setattribute("value", information.txtuser.text)
webbrowser1.document.getelementbyid("login-password").setattribute("value", information.txtpass.text)

what should i quarrel info now? i attempted removing component name kept removing index out operation error, index should -1 0, nonetheless was.

your assistance severely appriecated!!