To protect your Yahoo account from any kind of hacking and breaching activities, it is recommended to regularly change your password. Even if you have strong password protection, change your password to keep your account secure. You must know how to change Yahoo password if you suspect that your password has been compromised and anyone is accessing your Yahoo Mail account.
You can easily change your Yahoo Mail password under the Account Info section of your profile. Choose the Change password link from the How you sign in section to change your password. Changing your password regularly helps you to protect from unauthorized access to your Yahoo account.