I've filled out all the pages exactly the same as my previous router, but it just doesn't want to give me any internets... There are a couple (a lot) more boxes that look like they need to be filled out compared to my old router, but I have no idea what they do. So this is where i need some help if anyone is kind enough :)
Screenshots of my current config on the Setup/Basic and Setup/Networking pages:

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I'm running DD-WRT a Netgear N600 WNDR3800 (don't worry, i have an AC1900 WiFi access point :P)