First, go to [Settings] > [Website] > [Images]

 

Here, you can upload both Slideshow Images and Gallery Images.

The slideshow images are the bigger, first-in-sight slideshow images. The dimension for these images is 1280 x 480.

 

The gallery images are supplimentary images that shows more images about your property in the footer of the Website, and in [Gallery] section of the Website. The dimension for the gallery images is 960 x 640

 

To upload these images, click on [Upload Image] button, and select the image you want to upload in your local hard disk. Then, click on green cropping icon to finalize the cropping and uploading the image.