Screenshots for MACs/Jolly Roger Invasions

[Arman Sharkidd]

My friend and I tend to take quite a few screenshots, especially during the invasions, so I was wondering if any of you could tell me how to access them from my MAC computer. If any of you can tell me how, I'll be really grateful. And, tell me what you like about the invasions and what you don't. Have you killed Jolly Roger with very few people, such as one of my other friends did? Was it hard? Easy??