RADIUS clients are network access servers, not client computers. If the local computer is running HRA, you can skip this ...

RADIUS clients are network access servers, not client computers. If the local computer is running HRA,  you can skip this step and click Next.  If you want to add remote HRA servers as RADIUS clients, click Add. All remote HRA servers that you add must also run NPS. Also, remote HRA-NPS servers must forward connection requests to this NPS server (the local computer).