When add distribution points, i can't find my client pc?

Hi Expert,

i'm new to SCCM and studying deploying Office proplus using SCCM2012. I'm following this article: https://technet.microsoft.com/en-SG/library/dn708063.aspx. As you can see in the following screenshot, only one computer name displays there. It is my SCCM server. I have already added some WIN10 pc into the domain DSCSKDC. But i can't find any client pc. Could you guide me?

Thanks,

Sky Pei