on top_left , you can see import tab beside of scene tab.
you can change this image’s sittings using this panel.
It’s an Image resource, Godot imports images as resources, since it was converted from something else it’s marked as read-only so you don’t try to make changes to the converted resource, if the image changes it will need to be re-imported. Godot does not have 2D image editing capabilities so if you want to change the image you will have to do so elsewhere.