Orbi AC2200 won't connect to internet

Hi there, I am hoping someone can help me. I just bought a Netgear Orbi AC2200 router and 2 satellites to strengthen my internet for my parents as they have just moved into our granny flat and they cannot pick up my internet. 

However on initil set up I cannot connect it to the internet. I just rang the Netgear helpline as they say you get free support for 90 days, however on talking to them they said they will need to charge me $69 to talk to a Mac specialist to change some settings on my Apple computer to configure it. 

Is this information available anywhere for me to do myself? I just spent $450 already on the system, and no where does it tell me that I will have to spend hours failing to connect and then eventually spend another $69 to fix it. I think thats madness! I was just wondering if anyone knows what settings need to be changed on a iMac to get it started. 

Thanks so much in advance!