How to release the electronic clutch idling mode:
On your transmitter, the forward and reverse driving trim tab is placed in the down position and then the driving stick, quickly, is moved down and then quickly released to it's center position. Put trim tab back to neutral, do not forget! Your good to go. If the image will not enlarge for you, go to the link below and scroll down to Step 3 in the Operation Manual.

JS_2 Manuals: https://www.tamiyausa.com/pdf/manuals/56035ml.pdf

John