You should be able to do it from here (although, I'm using an older version so it's possible that somethings might have changed since then):
It has changed.
I just checked that and I couldn't find any option to copy or save the QR code image in request tab. In the newer version, you should go to "Addresses" tab instead.
To OP:Go to "Addresses" tab abd double click on any of addresses you want. (If you don't see "Addresses" tab, click on "View" at top of the window and then check "Addresses".)
After that, click on the "QR code" button at top right side of the window and you will see the window displayed above in OmegaStarScream's post.