How to connect Macbook Pro 2015 and 2 x Dell U2518D monitors

I bought 2 x Dell U2518D monitors to use with my 2015 Macbook pro 13". This is a 2560x1440 1440p monitor. All the forums said this could be done and that they were compatible, but I didn't check the dell driver page. When I did check the page, there were no macbook drivers.

When I plugged the firs monitor in, nothing happened. It just went to sleep, said no HDMI input found. This has never happened before with any other external monitor.

Do I need mac drivers?

I have the USB cable plugged into a USB port.

I have the HDMI cable plugged into the mDP.

I also bought the DELl 6000 universal docking station. Not yet tried this, I thought I should be able to plug the monitor straight into the macbook.

I'm not really very techy, clearly. Please be helpful.

Thanks.

No, you do not need Mac drivers for this monitor to function.

I think the problem is your cable. I would suggest using the cable that came with the monitor to connect the laptop and the display. That cable is a Mini DisplayPort to DisplayPort cable. If this is actually the cable you've used (and not HDMI as you mention), then try getting an alternative cable to test with.

All you need to do is to plug that cable into the laptop and the monitor, and you should get a picture. You might need to set the input on the monitor to Mini DisplayPort if you have disabled the auto function.

If that fails to work with a good cable, try rebooting the laptop with the cable plugged in. That should definitely not be necessary, but just to test out every option.