Click on any place of your image to bring up the red square box.
Adjust the red square box over a wall or area where you want artworks to be placed.
In order to do that, move the box around, put it over the desired area, and drag its vertices to match wall's vertices. This is important to reproduce wall perspective as accurate as possible.
Enter the height for the area you just defined
Use slider at the bottom of the window to specify the height of the defined area. This is important to have a realistic sense of scale, and see how artworks would really look when placed, based both on artwork size and wall dimensions.
If you don't know the height of the area and you can't measure it, use an approximate value.
Click on the button DONE next to the slider at the bottom, to save. You can edit the area and change any data by clicking on it after it has been created.
Add more areas if needed
Repeat the previous steps to add more areas to the the room where you would like artworks to be placed.
Once you are ready, click on SAVE AND CONTINUE to go to next step.
Enjoy trying artworks
Move the artwork to the desired position within any of the wall areas that you have defined in the previous steps.
Click on the Artworks button in the top right (if visible) to bring additional artworks to try.
Drag-n-drop the artworks onto the walls, change their position, and see what fits best!