by Dani Palou.
Hi Logan,
just to be sure, you should be able to see the signup button after entering your site URL in the "Add Site" form. It should appear below the username/password inputs, as it's shown here:
If you can't see the button, please send us your Moodle URL so we can take a look. If you don't want it to be public you can send it to mobile@moodle.com (please reference this post in the e-mail).
Kind regards,
Dani