It's easy to place the Channeltivity login form on your site or anywhere else using the code below as a template.
Make sure to replace the https://Your-Partner-Portal-Domain/ below with the link to your portal and then use CSS and HTML to change the layout and styling to fit your needs.
<form method="post" action="https://Your-Partner-Portal-Domain/">
<input type="hidden" name="RemoteLogin" value="true" />
Email: <input type="input" name="email" />
Password: <input type="password" name="password" />
<input type="submit" value="Login" />
</form>