Help With Xcode Web Browser

ok so what i'm trying to do is make buttons that will link to another website, like a button that will take you directly to youtube. So for that do i have to create other files in the class folder? and what will be code?

Also I'm trying to add a google search bar, but i don't know how to do it.
Please help me since most of the tutorials on the internet are either old or just for an iphone app.