I installed the Stamps.com Connect to my computer and I can't uninstall I installed the Stamps.com Connect to my OS X Macbook. I cannot get rid of the stupid thing. I cancelled my subscription the day I created it but I cannot get the icon off of my menu bar not can I delete it from my applications. I have not been able to use the command key to drag the icon because that just opens it in the menu bar. In the applications file, it will not let me delete it because "it is in use." I am at my wits end. Please help. Thanks!
Your application is probably running in background, so you have to "kill it" before you can uninstall it.

Using Activity Monitor, find the Stamps.com Connect process and double click on it (using Acrobat as an example because I don't have Stamps.com; the process is the same, however).



You will then be presented with another dialog which will allow you to quit the running process:



Select "Quit."

You should then be able to uninstall the software.  As for uninstalling it, I recommend using AppCleaner.  I have used it for many years and it has been successful in removing even the most stubborn of Apps.  Plus, it's free.