I hate to keep beating a dead horse! However, the following is simply my disclaimer:
To reiterate, you are attempting to use this radio for a purpose it is marginally serviceable for (technically, the manufacturer and/or distributor have specified it is unsuitable for, due to lack of range). The servos provided with the radio set, possibly lack power for this aircraft. The receiver is meant to get it's power from the electric motor batteries (this is a surmountable problem, which you may have remedied already).

The best help you can get, is to get with R/Cers in your area to help you learn about the hobby, installation of R/C equipment into your airplane and how to fly.

My best suggestion would be to put the sailplane aside and get a small Park Flyer model more suited for the radio you have purchased.