Launcher Pro Modification Question?

I exported Launcher Pro from my phone and made a change on the calendar widget. My question is how do I reinstall the Launcher Pro.apk file?

Thanks

 

once edited and unless you can resign the app you'll have to uninstall launcher pro on your phone then push your edited version to system/app. You must be rooted of course.

 

How do I push it to system/app? I uninstalled launcher pro first. Then opened Astro and found the launcher Pro.apk and tried to install and it would not install.