Accounts are created when you order hosting, so there's no separate sign-up.
You already have an account. Sign in, or if you have only ever paid invoices from an email link, set your password first.
Your account is set up as part of your order, all on one page. One plan, one yearly price, and help from the people who run the servers.
Have a question before you order? Ask us and we'll get back to you.