How to add data using angular?

Question

css

I have such a problem, I have a comment block where data from $scope is loaded when loading, i.e. user name, date of departure, message text, so
1) I don’t know how to implement so that only 5 comments come out
2) there will also be a button at the end of the block, when clicked on, 5 more comments would be loaded
Can you advise how to do this? Suggest an idea?