Saved logins and passwords
In this section:
When you first log in to the mobile app, you can be prompted to save your login to your device. This allows you to share the same login information on both the web and in the mobile app, and helps you manage multiple accounts if you need that.
Tip
If you use 1Password for storing passwords for other applications and websites, you can use 1Password for logging into Services.
To save your password, toggle on the Save Login Details option before logging in. If you're not prompted to save your password, set up iCloud keychain to keep your passwords updated across your devices.
If your login details have already been saved, you'll see a popup on the login screen that will allow you to use that information.