Individuals can register for an account at SignUpGenius by going to the SignUpGenius website and clicking the Login/Join button at the top right corner of the page. On the Login page, click the New Member Registration tab and enter their first name, last name, email and password to register.
It's free to register for an account on SignUpGenius. However, unless the creator of a sign-up form specifically requires people to register on the website to sign up, individuals don't need to register for a SignUpGenius account to sign up for something. They need to be a member of the site to create sign-up forms.