Usually the manual for the transmitter will have a description of what each adjustment does. Sometimes the translation into English makes the description of an adjustment hard to understand. Each manufacturer has their own quirks, so if you have a question about a specific transmitter you will need to ask on the thread for the transmitter.
The throttle profile thing sounds like an adjustment if you are running a throttle servo on a nitro vehicle. If you are running an electric car with an esc I would make all of your throttle adjustments on the esc and leave the throttle channel alone on the transmitter. Set the throttle end points to 100 and leave them there.