The dvd if you saw that burned right away using the MC tool cannot be used later or at any time for a clean install! That can only be done by the USB Installation Key.
You may also want to grab the chance to create a " Recovery Drive " once you decide on which type of install you will be going with. That can be done at any time actually which might be an idea to see to now and boot from since you can see the PC Refresh option used right now for a clean install.
I saw both upgrade installs simply running from a flash drive made into a key as I have been doing for 7 as well as having tried out the 8 Customer Preview back in 2012. The PC Refresh option is covered well in the next guide I can point you to seen at How to Refresh Windows 10
The PC Refresh seen in Windows 8 didn't see the option that 10 now offers of allowing you to save files! This is something brand new where you still see a clean install of 10 but also see your stuff backed up by the 10 installer as you go along. That's a first for Windows since previously you would have needed to run the Windows Easy Transfer tool in order to back things up from both the Program files, Program Files(x86) included on the 64bit Windows, and the users folders for the accounts there.
What is interesting when looking at the Control Panel>Backup & Recovery now is seeing "Backup & Recovery(Windows 7) on this section in 10! That indicates I should still be able to roll back to the temp install of 7 note on what had been the second OS drive. That however won't be happening regardless since the present upgrade install here will soon be nuked off the drive entirely to see a nice clean install one way or another go on!