Action Details
Requirements and how-to articles for Snapchat's action:

Create and set up a Snapchat account.

You need this to get it done:

The name you wish to be known by on Snapchat.
A unique username (you cannot change this later.)
Email Address
A valid email address to be associated with your account.
Date of Birth
Your date of birth (month, day and year.)
Phone Number (optional)
A phone number is optional, but allows for extra account security (if you ever get locked out of your account, your phone number can be used to send you a password reset link via SMS.)
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How-To Articles
A list of useful links for you:

Snapchat Business Center - Create a Snapchat Account
Official guide on how to set up a Snapchat account.
Link missing here or found errors? Improve How-Tos