If you want to reset your yahoo account password then check the below steps to change it.

1. After sign in click on Yahoo account settings.
2. Go to your Account Info.
3. Open your Yahoo Account Security page, and type your current password.
4. Choose “Change password”.
5. Create a new password and change it click on "Continue"

I hope these simple steps helpful to you if you want to complete a guide on Change password in Yahoo mail then check this post.