Thanks for reaching out to us!
There is a basic tutorial here. Achieving this should be pretty straightforward – basically choosing your desired layout on the left, and then dragging on the images from the Photo Basket at the bottom. For making it 11×17″, choose 11×17 when creating your collage in the dropdown on the left that says “No Constraints”.
Also note that you can drag images “between” cells to insert a new cell, that way you can add more images to a layout. You can also delete cells from a collage by clicking the cross up the top right.
Let us know if you have any other questions!
Regards – The Ribbet Team