Not able to select a Port to flash my board

I am using a Multiwii control board on version 1.6.7 of arduino, I am able to set up my code and get everything ready to flash my board, but I don't have an available port. I found out my computer doesn't have an ft232r usb uart driver installed and I cant seem to find one on the internet. If anyone has a way for me to get a port for me to begin flashing please let me know, thank you.

I am using a Multiwii control board

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