To insert an image click on the image icon on the top of the online designer page.
This will open your gallery:
Click on the image that you want to upload and it will highlight that image with a teal colored box. I have selected the last photo in my gallery. After selecting the image, click the insert button in the bottom right hand corner.
After clicking insert, your image will be placed in the center of the screen. If you need to resize your image, please see the instructions for resizing in the Help Center.
For more download the video tutorial below: