I have powered up my miner and connected the ethernet-cable to my laptop. But I cant access the Antminer via its IP.
Whats wrong?
Edit; I followed this guide at first, changing the network settings and w/e. But now I se other guides that just connect miner and pc and then just type in the IP in the browser to access the miner.
Now nothing works..

You can connect directly to it, but your laptop would have to have a static IP, *AND* it would have to be on the same subnet, with the same gateway settings (though this latter might not be absolutely necessary). So, if your Ant S1 is at 192.168.1.99, then you need to be sure you laptop is somehwere else on 192.168.1.x, where x is not equal to 1, 99, 254, or 255). Then you should be able to go straight to it in your browser.
The reason many folks can just plug and go is that for them, they've already got a static IP and are on the right subnet (192.168.1.x) and gateway. It's a fairly standard setup that puts you on 192.168.1.x and with a gateway of 192.168.1.1, so you might just have to set a static IP.