It seems like the *.fdl files in the program folder might be read only. Please follow the instructions below and then try to customize your labels.
- Close all the running programs
- Double click on the "MyComputer" icon on your desktop
- Double click on "C:\" (local) drive
- Double click on "Program Files\MySoftware"
- Double click on "MyLabel Designer Deluxe" folder
- Click on the "Search" button at the top of the screen
- Search for all files and folders
- Search for "*.fdl"
- Once you get the search results, right click on each file and left click on "Properties"
- Uncheck the box for "Read Only" and press "Ok"
- Now open the program again and hopefully that should allow you to customize the label.