Go to the View menu, choose Toolbars, and at the end of the list choose Customize. This will display the Customize dialog shown at the left. Select the Commands tab and then choose the Tools item in the Categories list. Scroll down in the Commands list to COM Add Ins.... With the Customize dialog still open, drag the COM Add-Ins item to the Tools menu. The logical place is to put it just below the existing Add-Ins... item.  Now, close the Customize dialog. Now, you can click the Com Add-ins... menu item to display the dialog, shown below. From this dialog, you can load, unload, add, or delete COM Add-ins.

Note that the COM Addins dialog will display only CAIs listed in the HKEY_CURRENT_USER region of the System Registry. It will not display CAIs that are listed in the HKEY_LOCAL_MACHINE region of the System Registry. This is done to prevent a single users from modifying the environment that affects all users of machine.