LynixF

I have a rocket that I sent to the moon in a crazy elliptical orbit around Kerban, it has fuel and all, but there is sadly no battery left. The vessel has around 300 science packed on it, and I have no idea how to send a ship to return it. I can get to the vessel rather easily, but once I get it how do I 'attach' the two ships and de-orbit the lander?