Your blogs published through tripoto is judged by a panel of editor on parameters like content, originality, details, pics quality and how its going to help others. Based on that you get credit. One blog contains highest 100 points and they credit based on these parameters. Also views on your blog and wish-listing by others gives you extra points.
Originality and good content are through which you earn credits on Tripoto. Write an interesting blog with all the details, experiences, suggestions and add some really great pictures of the same. You're good to go.