The RFID reciever has a serial female connector
Which almost certainly means that the output is RS232 (+/-12 V and inverted from TTL levels).
Well i cannot figure out how i can read serial data from the RFID reciever using UNO and then transmit it to the PC and view the data on the Serial Monitor. How can i hook up the Tx from the reciever to the RX of UNO, isnt the RX of UNO reserved for the serial communications with the PC?
How have you connected the device to the Arduino?
When you get your new Arduino and a MAX232 chip (to convert RS232 to TTL that the Arduino can use), we can help you hook everything together correctly.