My site looks different on my mobile – how do I change?

Hello, my site http://www.luxurynewsonline.com looks really basic on my iphone and totally different on my ipad and on my Mac and PC. How do I just get it to view normally on my phone? I have tried installing a plugin which hasnt worked. I am using WordPress 4.0.1 running Yamidoo Magazine theme. I dont know how to code or or add code, is there not an option that i can just click? Thanks, James