You can create a 1SE account using your Google account or email & password. Download the app, then tap I'm New Here > Create Account.
If you're already a user, go to the app's Settings > Sign in or get an account.

With Google
 

  1. Select the Continue with Google button.
  2. Select the Continue button in the alert that's presented.
  3. Select which email account (or add an account) that you'd like to create the account with.
  4. Follow the prompts given to create your account.

With Email

  1. Select the Sign up with Email button.
  2. Enter your name, birthday, email, and password to create your account.
  3. Tap on Create Account.
  4. Follow the prompts given to create your account.
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