You don’t need a separate form to create a register page.
Go to the network Dashboard » Network setting » Enable both sites and users can register, and you are ready to go.
Visitors now to your site can register a new site at this URL:
yoursitename.com/wp-signup.php
And for reference you can go through this source to get a bit more handy on WordPress Multisite:
Let me know if helps to solve your problem.
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