64bit 32bit doesn't matter, the edition you have is entitled to either Bit versions. The edition i mean as in Home Premium, Professional, Ultimate etc needs to be the same. Say if you upgraded from Windows 7 Professional, Windows 10 will then be upgraded as Windows 10 Professional and if your friends Disk was say Windows 10 Home Premium, that will not work. Microsoft's online activation will see which edition your key is registered to and wont accept. You can see there in the pic 'Windows 10 Pro' beside the large Windows 10 logo in blue, that bit of description needs to be the same as written on your friend's DVD.
That screen will be under System and Security in Control panel. In your search, the bar that pops up with your start/windows key, type in either System or Control panel. Typing either will start giving you results more or less straight away. Look for System information or open Control panel and find System and Security, you'll have System option to click on there.
To install from either USB or DVD yes, just enter your bios (Usually delete key on bootup) and in there you'll have boot options to select. UEFI Bios's should have a picture of HDDs, USB, DVD trays etc. Click on which method you want to boot from and next time you reset the PC will attempt to boot from that device. If Windows 10 install was successful to boot will take you through the process of installing.
Install process will take you to an area where it will ask to partition. Partition is like foundation to your house for Windows to sit on ;P , so it will ask to create one. When you do there will be a small amount of the HDD or SSD space, which Windows needs to work with so that's normal if you see that, the rest of the hdd will be just the one partition.
Once Windows is installed on the SSD, copy what ever you like from the HDD over if theres anything there worth saving then format it, use it as a storage drive.
Remember never to defrag an SSD
Not like conventional HDDS, defragging will harm the SSD.