the first thing i noticed is that your card image has a lot of blank space in it! the way your code is set up does actually place the text within the image, it's just over in that blank area. the first step would be trim off all the transparent parts in an image editor.
next, put the new version of the image into the generator to get new slice and width values.
after that, you can adjust the position of the text within the element by adding some padding. you'll need enough top padding to push the text below the magnemite art on the card, and a little bit of padding on the sides.