I am bit confused in what you mean by get a second computer to use My Cloud Home. May be you misunderstood how MCH works. The My cloud home works similar to a external hard drive, but on your local network
If you want just copy your files to the device, there are 2 ways to access the device and copy files to it:
1 - Using browser - Just go to http://www.mycloud.com/, in the left is the mycloud home device and on the right is the regular my cloud device. Assuming that you have the My cloud HOME device you just click on the "sign in to your device. Log in with your account and you are ready to upload files to the device. Just drag and drop your files and folders from windows explorer to the browser window and it will start upload.
2 - Using wd app - Download the WD discovery desktop app for windows here. Install it and the device will be mounted on windows explorer just like and external hard drive. Than you just copy files to it. http://downloads.wdc.com/wdapp/WD-Discovery-2_1_288.zip
BUT, if you want to SETUP A BACKUP OF YOUR COMPUTER, I think that is what you misunderstood how MCH works. The WD My Cloud Home won’t setup a computer backup automatically for you. It will just be available as a destination for your backups when you set your backup ON windows OS. , So YOU will have to setup a windows backup by your self, and choose the My cloud home as the drive to store the backups… That is what I was trying to say in our last conversation.
I don’t use windows, but I found a quick tutorial on wd website that teaches how to setup a backup on windows 8 and 10 computers . It seem that “file history” is a windows built in tool that allows you setup backups on windows 8 and 10.
Take a look at this link. But again, you will have to setup this on windows, not on the MyCloud