In order to add structural columns in Revit Architecture you have to place the columns at specific grid intersections, now Double click level 1 in the project browser In the home, ribbon tab click the pulldown for column and select structural column Now for the type of column choose the concrete-regular column of 300X450mm Place the column of A1, making sure that the grid lines are purple when placing. It will confirm that the column is in the center of the two grid lines
Me thinks someone is trying to up their solution count.
But what if the OP doesn't have any columns loaded in the Project?
@Anonymous: First thing you want to do is go to Insert Tab=>Load Family=>Browse to your "Structural Columns" Folder in your Library, and select the Column(s) you want to load into your Project and use.