Drop the file here to start creating a stroke for the sticker.
or add a file from the panel on the right.
or add a file from the panel below.
This is start point, you cannot change this point type, but you can allway cover it with some other point.
The link you have inserted is incorrect or does not lead directly to the image file.
Make sure that the end of the link is followed by a .jpg, .jpeg, .png extension.