You can create a 1SE account using your Google account or email & password. Download the app, then tap "Create Account". After it, you'll be offered with a PRO free trial. You can take it or not, totally up to you.
If you are on an iOS device and have been using the app for a while without actually having an account, go to the "Profile" tab, then tap in the "Create Account and Back Up" button. Please note that this won't delete your current snippets!
On an iOS device
- Select the "Continue with Google" button.
- Select the "Continue" button in the alert that's presented.
- Select which Google email account (or add an account) that you'd like to create the account with.
- Follow the prompts given to create your account.
On an Android device
- Select the "Continue with Google" button.
- Select which Google email account (or add an account) that you'd like to create your 1SE account with.