I thought you were using a Mac when I saw the screenshots; weird that they made the interface look so similar and even used "Finder" as the program name.
In File Explorer, you need to enter it in network address format (UNC path). It should be "\\192.168.1.70" (no quotes of course). You may also just be able to click on the Network in the left panel of File Explorer and see the device listed there. But until you configure shares using the web interface, there shouldn't be any folders there to open.
You need to use the web interface to configure the sharing (it probably won't automatically share the USB drive you plugged in), change the web login credentials for security, and set a username and password for the shared folder (again for security in case someone connects to your network so they can't just browse your files), then access it from File Explorer. You would also want to give it a static IP address that is not within your network's DHCP range so that it doesn't randomly change, and you can then map a drive letter to the share for easy access and treat it just like a drive in your computer. (I don't know if you need to set the HOME folder per that one message in order for the basic functions to work while you wait for the hard drive. If you set it now you'd have to point it to the USB stick and then go through changing it to the hard drive later.)
Once you have the test share set up, and you browse to it in File Explorer and enter the username and password you set up, you'll see the share name. Right-click on it and you can select Map Network Drive and give it a drive letter. (Later when you have the real hard drive, you can right-click the drive letter and Disconnect the test folder.)
If it does NOT support SMBv2, then you probably won't be able to browse to it in File Explorer at all. You might be able to see it on the network (not sure), but won't be able to open the shares. You would need to go through the steps to install/enable SMBv1 in Windows at that point.
I don't think we need to have the ISO of the disc that came with the device.
