All of the ARCHIBUS commands are on the ARCHIBUS tab of the Revit Ribbon menu.
Some ARCHIBUS commands have two modes of selection. For instance, if you first select a series of Revit elements, then you invoke Catalog or Edit Data Multiple, the commands will work on that selection. If instead you invoke the command first, the command will prompt you to specify or select which elements to operate on. See Selecting Multiple Revit Elements.