If you've previously signed in using your Google, Microsoft, or Apple account, Haystack uses these credentials as your login. So if you want to login, the best way is to login again with the same Google, Microsoft or Apple credentials.
If you wish to 'switch' your sign in method to also sign in with email, here is how:
Open this link in your web browser
Select "Sign in with Email"
Enter your email address and select "Next"
Select "Add a password"
Select "Send Email"
An email will be sent to your account email address.
Open the link in the email and follow the prompts to set a password.
After you've set your password, you're ready to log into your app using the "Sign in with Email" option.