help - I can't access yahoo mail since changing password

I found the answer on yahoo. for anybody else who has this problem: You start from within yahoo. Reset the password and click the button to generate app passwords. And then you can generate a specialized password for each of your ios devices.

Here's what it says in my yahoo account:

App passwords

Certain apps don’t work with Yahoo’s second sign-in verification.
They include:

Mail apps like iOS Mail, Android Mail, and Outlook

To use these apps, you’ll need to generate an app-specific password, and then enter it in the password field of your app. You’ll only have to create and enter the password once for each app. Learn more

And here's the help page.

Generating App Passwords

To protect your account, you're required to generate a one-time password, separate from your Yahoo account password, when you use non-Yahoo apps.

Here's how:

1. First activate second sign-in verification on your account to use App Passwords.
2. From your Account Info page, click App Passwords.
3. Under "Generate new application password," enter the name of the app that requires a password.
4. Click Generate Password.
   Tip: This isn't a new password for your account. It's a one-time password to validate you're authorizing access to your account from a non-Yahoo app.
5. Enter the code into the password field of your mobile device.
6. Click Done to reset the code generator.
   -If you forget the code, you can always generate a new one.

You're now safely connected!

We'll save a list of apps within your "Generate app passwords" page. Also from this page, you can generate a new code or remove permissions.