I have been able to get my bluetooth device paired with my computer but when I try to upload the sketch I get an error message
I hesitate to buy into this thread, it seems to be just circular nonsense, and now you seem to want to upload your sketch via bluetooth - another diversion somewhat unrelated to RC cars. Since you are having so much grief, you might try using bluetooth with a phone. It seems to be a lot easier - no grey areas about ports etc. and leave the IDE and uploading to the PC - by cable.
IF you mean you have difficulty uploading in the normal manner AND bluetooth is on hardware serial, disconnect it and try again.