Image files do not support text layer by design. Once text is added (with Photo Editor) and image file is saved, all information is interpreted as image.
You may edit this image with Photo Eraser in order to remove the text.
By default InPixio Photo software do not overwrite the original image file, instead new one is offered to save. If you have taken this recommendation and did not overwritten the original image file you may start new project and create new image file with text added to the composition.