From the menu: Edit → Advanced Search, or from the icon on the Search group of the main bar.
First, select the appropriate object type by a click one of the radio buttons. Then enter its ID in the bottom entry area.
The buttons can help you to enter the catalog - and the object id at the right hand side of this area. When the object is found, the chart will be shifted so to display the object in the centre.
Maybe you didn't get a result, because SkyChart could not find the object in the configured catalogs. Click here to read more about configuring catalogs, or click here to read about the installation of extra catalogs.