vbscript

i have some html code i need to login to this form how can i access to this form i want to use vbscript or javascript:
<ul class="userLogin">
<li class="loginUsername">
<input autofocus class="email"
type="email"
name="username_or_email"
placeholder="Email"
autocomplete="on"/>
</li>
<li class="loginPassword">
<input type="password"
name="password"
placeholder="Password"/>
</li>
</ul>