1. Create a magazine
2. Create an issue
3. Add at least 10 articles to this issue, 6 vertical and 4 horizontal
4. Open the issue and switch to design tab. Choose 2 rows and 3 columns for vertical items. and 2 rows and 2 columns for horizontal items.
6. Create images for each article
7. Open the articles and on the image tab assign the image for the article.

That should do it.