I have RAM Connection installed, but the RAM Connection button in RAM Structural System is disabled.
The RAM Connection button in RAM Structural System 14.6 provides integration with RAM Connection 8.1 or later. However, as of December 2, 2013, RAM Connection 8.1 has not been released yet.
Install RAM Connection 8.1 once it becomes available. In the meantime, open RAM Connection (not Standalone), load a RAM Structural System model, and model connections from there.
Structural Analysis Support Solutions