|First Choice is an old Windows 3.1 application. It runs inside a Virtual DOS Environment on Windows XP (since XP has no real DOS environment).|
Your printers do not work in DOS because DOS cannot detect printers that are connected to a USB port, and the printer drivers are not DOS-compatible anyway. Consequently, the program will not be able to "see" your printers, and you cannot add them to the program.
The program was designed to be used with the now obsolete printers which were connected to a computer's printer parallel-port (also called LPT1). Most computers do not have a parallel-port nowadays, and no modern printer has a parallel port connection either.
The bottom line is that you can't use your printers with that program unless you can find an old parallel-port printer and a PC with a parallel-port.