I am trying to add a new card, as well as modify the existing one, but I can't. Is there any issue with this version of the application? What should I do?
No, there isn't any issue with this version of the software. In order to fix the problem, I recommend that you uninstall the utility (Control Panel > Uninstall a program) and then install it again. After that, use the official user guide to add your new card and modify the existing one. If the issue persists, try contacting the official developers.