In the panel Source file you'll find the option for selecting the file that you want to upload. Find the one you want and click on the restore button to recover it: You can also set a Vertical alignment. For more information on how to add more or remove allowed file types check out the section in this tutorial on how to change the allowed file types. Resizing an image is easier said than done. As members have already mentioned to use the available libraries but since you are new and IF you want to show all images to a specific size you could do something like;.