How to add decoupler to Staging List

kerbal-space-program

I'm having a problem with Kerbal Space Program where decouplers are not appearing in the staging list. Instead they are just to the left of the staging list. I can click them and drag them but they won't go into the staging list. Even if I add an empty stage and try to add them to it, no luck.

Best Answer

When the decoupler icon appears next to the staging list instead of inside it, it usually means that the decoupler (and also anything attached to it) are not attached to the main vehicle but instead "floating" in the construction building. When this is the case, the decoupler (and anything attached to it) should be rendered slightly transparent.

To attach the decoupler, click it and then place it at a valid connection node. Keep in mind that ring-shaped decouplers can not be attached to any surface, but only to nodes marked with green spheres.