LaserJet Printing

Hi: )

so, 

Im trying since hours, no joking, to connect the printer to the new router. And quite frankly what startles me the most is, when I look at all the advice Ive already read, that when I set the connection up the first time with the old router, it was a matter of 10 minutes, basically the devices did it themselves. How can it be so impossible now?

I switched the printer on and off, completely restarted the printer system (turning it off, pressing x and wireless button, turning printer on, holding both buttons until he stops making noise), I switched the router off and on, I deleted the printer in my computer and added it again, I changed some settings in the html config like adviced in a hp video on youtube (which is a huge drama in itself as the webpage constantly disconnected from the server when I pressed some buttons it diddnt like me to press...). In the end, it was supereasy when I first did it, and now I dont even know where the problem lies. Is it the printer or the router or some configuration in the printer settings thats not right... Im lost. I so hope u guys can help 🙂