If you're 18 years, or older, you can go to the Zoosk home page and click the "Sign Up" button.
From there you'll select what your gender is, and what gender you're interested in meeting, along with your date of birth, email address, and a password for your account.
Once you've submitted all the information you'll receive an email to confirm your account at which point you can create your profile; some information about yourself to let other Zoosk users know more about you.
Zoosk also offers a Facebook app, as well as apps for your mobile devices available from Apple, Amazon, and Google. It's free to sign up and begin using, but for all the features of the site a subscription is required.
You can find out more about Zoosk from their FAQ page.
In "safety comes first" news, Virtual-Strategy.com is reporting that Zoosk has Addressed a Top Online Dating Concern with the Launch of their Photo Verification Feature.