Many modern devices and platforms offer the option to sign in using a PIN instead of a traditional password. This can be a convenient and secure way to access your accounts quickly. Here's how you can set up and use a PIN for signing in:

1. Go to your device or platform's settings.
2. Look for the security or sign-in options.
3. Choose the option to set up a PIN for sign-in.
4. Follow the on-screen instructions to create a unique PIN. It's recommended to use a longer PIN for added security.
5. Once your PIN is set up, you can use it to sign in instead of entering your password every time.

Using a PIN for sign-in can be more convenient, especially on devices with touchscreens where typing a long password can be cumbersome. However, it's essential to choose a secure PIN and avoid easily guessable combinations like '1234' or your birth year.

Remember to keep your PIN confidential and never share it with anyone. If you suspect someone else knows your PIN, change it immediately to protect your accounts and data.