MyBB Community Forums

Is there anyone who knows what codes that needs to be inside the page?

ACP -> Templates & Style -> Templates -> Your theme -> Member Templates -> member_register

That's the template for MyBB registration form. Just edit it however you require and use it.

To include the login box on a page (outside of the forum) just include this piece of html:

<form action="http://url-to-your-forum/member.php" method="post">
<input name="action" value="do_login" type="hidden">
<input name="url" value="http://url-to-your-custom-landing-page/" type="hidden">
Username: <input name="username" maxlength="30" type="text"><br>
Password: <input name="password" type="password"><br>
<input name="submit" value="Login" type="submit">
</form>