Explanation for uploading images:

When you click on "Manage accommodation" in your user area and then on the right side next to the object on the yellow "Edit" button, the object opens.

By clicking on "Select images" a page opens from which you can select the images that are on YOUR COMPUTER and upload them to the website by clicking on "Upload".
 
Once the images are uploaded, you can select them (the order of selection will be the order on the page) and upload them to the page