You must have operator permission or cib.stationbuilder to place a sign for a station.
Please place a detector rail and place a sign at 2 blocks above. Then write "[CIB_MC]" in 1st line, and "NORTH", "SOUTH", "EAST", "WEST" (these are depature directions), or "TERMINAL" (for arrival only) in 2nd line, and finish sign placing.