So to be clear, download the program you have above "this program" which is the USR-TCP232-Setup V4.2.2, correct?
Also, the default for the baud rate, module port and destination IP are not the same as you have, does this matter?
Use 57600 as baud rate. Port has to be same as Telemetry port, normally 14550. Destination and gateway IP has to be RPI adress.
Where is the dnsutils and how do I download and install dnsutils to your RPI?
I got the the udp_redirect file from dropbox. I'm not a RPI expert, but do I save it to a specific location in the RPI?
You have to save the udp_redirect to a folder in RPI. e.g /home/pi
I will recommend you to just install the UAVcast, that package installs everything you need, including dnsutils.
However, if you just want to start the udp_redirect, use this command line. Set your gcs address in between those port numbers. Do not change the 0.0.0.0 in the begining. PS! You wont need dnsutils for this line.
./udp_redirect 0.0.0.0 14550 GCS_ip_adress 14550 &
This is based on if I am using the command line on the RPI, what if I am using GUI?
You have to use the command line to run these commands.