You will need to ensure hat the Zgemma is on the same IP address range - 192.168.1.xxx or similar.
If you have not set this up it may, if DHCP is enabled on the unit, get the correct IP address.
Download a program like Netscan; a simple network tool which will show all devices on your network.
Once you know the IP address of the unit then enter that I P address in your laptop's browser address bar and then follow wooshman's instructions.