I am having problems logging onto a new Dahua DH-SD22204UE-GN purchased on Amazon. I am trying to re-set the IP address. From researching online it appears the default IP is 192.168.1.108. Is this correct. Any advice would be great.
Yes, that's correct.
On the assumption you're trying the access via a PC browser that's using an IP address in a different range, you could temporarily change the PC IP address to be something like 192.168.1.200 and connect to the camera to activate it and change the address as needed in network settings.
Or you could use Dahua's ConfigTool to find the camera, activate it and change the IP address as needed.