First, get the data sheet for the BAP24 and check the instructions for connecting to a PC port.
Then, open the reference manual from Studio's menu and find the early section that tells how to use Studio to find which processor is connected and to which port. Then set the selections on the main Studio page and have at it!
Failing that, set up the serial wiring from the PC to the breadboard. Then with the BAP24 out of the circuit, wire the TxD to the RxD. Use a terminal program like HyperTerminal, which is built into Windows. Use this to "exercise" the PC's serial port. This will tell you which COM that port is, and whether it works properly for the Baud rate and other settings you plan to use.
It would help to have a small diagram of what your wiring looks like.
HTH
