As noted by Tailskid, you plug the Rx battery pack into the rx port marked 'Batt' or plug into any unused Rx servo port. On some limited channel count Rx's I.E. four channels, you may have to share one of the already used rx ports by plugging the the power and the servo to the Rx port through a shared Y cord.

Exactly what Rx do you have and what size is Your glow engine?

John