Although they don't mention it, make sure the wired network connection between your PC and the repeater is the ONLY active network connection. Having another active network connection could cause problems. You want this setup done in isolation.
As long as you manually assign an IP address to your PC as 192.168.10.2-254 and subnet mask 255.255.255.0 (although they suggest it, you don’t really need the default gateway, just leave it blank for now), and save it, your network should be configured properly, and the repeater should be accessible at http://192.168.10.1.