Windows 10 allows you to change your password or recover it at any time if you forget it.
You can sign into OneDrive simply by opening the OneDrive app, which is installed on every new PC by default.
Windows 10 has reached end of life, but you can continue using it by enrolling your PC into the ESU program for free.
Official Windows 10 support is ending very soon, but if you aren't ready to upgrade, you can still enroll for security ...