If you still have the Get Windows 10 icon in the bottom right down by the clock, click it to open it
There are three little lines stacked in the top right of that interface the call a hamburger menu, click that
You see, Ia have made a reservation on two machines running Windows 7, with only 4GB of RAM. I am afraid that W10 resources requirements will be higher, slowing down the machines, so I'd rather test W10 on a newer & faster machine before upgrading.
Maybe I could simply download the ISO and postpone the install?
It is almost impossible to get rid of the gwx app from a system that is running it now but yes you can always opt out of the reserve... a re-install of your basic w7 would be my advise but that's up to you mate... good luck.