Please use Settings / Export after You have selected the card profile to save the picture.
It will export only the card, cutting out the white space around it.
Note: if You leave the background on “none” (first icon) , the program will export it with transparent background, and you can put your own card background behind it.
Now you have to use an outside program like Photoshop or Paint to write the text on this PNG picture.
Note 2: the card frame can be moved to position wherever you like it.