New Desktop with Win 7 Pro - Has Win 10 Pro DVD; Steps to Upgrade

Just purchased new Dell OptiPlex with Win 7 Pro but I need Win 10 Pro.

It came with the Win 10 Pro DVD and when I boot from the DVD, it give the

- Return to Windows 7

- Troubleshoot

- Turn off Computer

screens.

Which option, I guess under Troubleshoot, do I use to install/upgrade to Windows 10?

Computer has no user program or data (just unboxed it).

(The reason for Window 10 Pro is that new software package states it will run under Win 8 or 10 but may have trouble with Windows 7.  Really?!?)

Have created USB recovery drive for the Windows 7.

Thanks.

Darryl