Are you entering 192.168.1.10 in your browser address bar?
At a command prompt type ping 192.168.1.255 when that completes type arp -a see if 192.168.1.10 is listed.
Factory reset the slave hub and start again.
Basically all you need to do is connect a laptop to the slave hub whilst it is disconnected from the rest of the network, turn off DHCP on the slave hub and change its address to 192.168.1.10 remember to save all changes.
Once you have done that you should be able to connect to the slave hub at 192.168.1.10 instead of 192.168.1.254
Then connect a LAN port on the master hub to a LAN port on the slave hub. Job done.
Thinking about it, you will need to connect the 2 hubs together before you will be able to connect to the slave unless you give your laptop a static address of 192.168.1.x (11,say) as it won't be getting an IP address from the slave.