The .xla just needs to be saved somewhere on your hard drive. Anywhere will do, but if you want to see typical locations, Google for location of Add-Ins for your version of Windows. Having noted where your .xla is, activating it also differs for different Excel versions. If you follow the Excel jeanie link in my signature, then click the 'How To' link on the left. Again on the left you will see two 'Activating ..' links, one for Excel 2003 and earlier and one for Excel 2007. Later versions have marginally different process but looking at the Excel 2007 version might point you in enough of the right direction. Otherwise Google again to find info like this.