[Cropping a layer in Affinity Photo]

I just purchased Affinity Photo and can't figure out how to crop a layer. I have found some tutorials from a couple of years ago that walk mr through it but they want me to use the "Copy Flattened" feature under Edit, and that is not there. do I need to do something to get that feature to appear, or is there another way to crop a layer?

[Where is the pages panel?]

I started my trial today. I am trying to create a 7 page PDF and am trying to add a new page. Right now I have one. I can't get the pages panel to pull up. I've gone to View>Studio and there is not option for Pages. The option go from Navigator to Paragraph. How do I add a new page to my document?