Your Yahoo password gives you access to every Yahoo service you use. If you've forgotten your password, you can reset it to get back into your Yahoo account. However, if you don’t know how to change Yahoo password on iPhone, from the Yahoo mail app, tap the Menu icon, and then tap on the Manage Accounts. Under the “Security settings,” enter a new password to change from the old one. Simple isn’t it!
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In general, working with a new iPhone if you had another OS before is quite difficult. I know that many people have profiles on cloud storage and a lot of information is stored there, so I would advise transferring all data to a new profile and using the Apple ecosystem, it is much more convenient. Even if you have some personal data, you can use tools like https://setapp.com/how-to/hide-photos-on-iphone and hide all information from public access, if it is more convenient for you.