In what way do you struggle? The main things to know are that buttons usually do what they say on them, and need to be pressed to make them work. Links will take you to other pages. Think that's about as complex as it gets?
How the hell do you struggle with Facebook? I'm not a user myself, but surely you just post vacuous comments on how you're feeling and continue txt chats on a larger screen than your mobile, or even post amazingly humorous pictures?