I have no idea why you asked this here instead of going to the site meta board (>>>/site/
), but here are the instructions I gave to another anon some time ago:
Click on the lightning button on the top navbar.
Create and account on the Register section.
Log in with your newly created account.
Somewhere in the options there's a Send email confirmation (or something like that) button that you need to press.
After ~30 minutes an email will be sent to the address you used to create an account.
Click on the link in the email to verify your account.
Go back to your 8chinz account page (use the lightning button) and create a board using the respective form for it.
Customize your board in its respective board management page.
9. Shill your board on the GG thread to get users.
As you can see, the process is easy.