Official Windows 10 support is ending very soon, but if you aren't ready to upgrade, you can still enroll for security ...
You can sign into OneDrive simply by opening the OneDrive app, which is installed on every new PC by default.
To change your account name on a Windows 10 computer, you'll need to go through your User Accounts menu. Here's how to do it.
Windows 10 has reached end of life, but you can continue using it by enrolling your PC into the ESU program for free.
You can choose to upgrade to Windows 11 for free if your computer is compatible. You can buy a new PC that already has Windows 11 pre-installed (or opt for an alternative, like a Mac or a Chromebook).