Well, for example, I would like to complain about the brevity of your question. My complaint is that it seems you do not care enough about your subject to give us any details. It feels like you just wanted someone else do it and that you can't even find the effort to be reasonably polite. My complaint would also be that you show a lack of awareness that we are doing you a favour, helping you with your homework. That is my complaint.
I could protest by demonstrating that i am upset in some way by refusing to co-operate. I could protest by not answering your question. I would be protesting by stopping co-operation.
So this is a complaint, not a protest because it explains my reason for being upset rather than being an unco-operative action.
Hope That Helps!
PS The word 'please' is six letters long and takes about one second to type, it is a magic word that gets amazing results in life. I suggest you try to use it more often. Thanks.