Select an image with the checkbox next to the file name and at the bottom the selection bar will appear. Choose the move button. Type in the name of the folder you want to move the image to, or click the create new sub folder option to create a new folder.

Alternatively, you can move an image to another folder simply by opening that folder, and uploading the image there. Img.vision will ask you whether you want to overwrite the image, just press overwrite. When the image is uploaded, the image will be located in the new folder, and no longer in the old folder.