Do NOT plug the two left over leads from the splitter together, they are only there in case you add further cameras in future, you have probably shorted out the power adaptor, which is why you are getting Video Loss message...
I am struggling to gain access over Internet, I have forwarded ports etc and when I go to the URL it asks for Username and Password, I have set a custom password, so what is the default, I have tried everything but it just says Login Timeout?!?