To create a password on Substack, follow these steps:
1. Head to https://substack.com/sign-in
2. Click "Sign in with password"
3. Select "Set a new password"
4. Enter your email address and click "Send Email"
What happens next?
You'll receive a password reset link to your inbox and can use that email/password combination to sign in to any of your Substack subscriptions.
Tip: In order to see the "Set a new password" page, you will need to be signed out of your Substack account. Click on your Substack profile icon and select "Sign out" from the menu. Once you're signed out, head to https://substack.com/sign-in to set a new password for the first time or reset your Substack password.