Q: How to delete a program I downloaded.

If you have not installed it yet, all you have to do is drag the downloaded file to the Trash and empty the Trash.

If you have already installed it then you must uninstall. Dragging it to the Trash will not remove it completely. For directions on how to do the uninstall, read http://www.ehow.com/how_6756259_uninstall-roboform.html

Basics for Uninstalling Software

Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash.  Applications may create preference files that are stored in the /Home/Library/Preferences/ folder.  Although they do nothing once you delete the associated application, they do take up some disk space.  If you want you can look for them in the above location and delete them, too.

Some applications may install an uninstaller program that can be used to remove the application. If you cannot find the uninstaller then you could download the freeware, Easy Find, to locate files that need to be removed. The places you need to search include:

1. /Home/Library/Applications Support/ folder. Check if the application has created a folder then delete the folder that's in the Applications Support folder. 
2. Applications may install a startupitem or a Log In item.  Startupitems are usually installed in the /Library/StartupItems/ folder or the /Home/Library/StartupItems/ folder.  Log In Items are set in the Users & Groups preferences.  Open it inSystem Preferences, then click on the LogIn Items tab.  Select the item from the list and click on the Delete [-] button to remove it.
3. Some software use startup daemons or agents.  Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.

Some applications install a receipt in the /Library/Receipts/ folder.  Usually with the same name as the program or the developer.  The item generally has a ".pkg" extension.  Be sure you also delete this item as some programs use it to determine if it's already installed.

There are many utilities that can uninstall applications.  Here is a selection:

1. AppZapper
2. AppDelete
3. Hazel
4. AppCleaner
5. CleanApp
6. iTrash
7. AppBolish
8. AppUninstaller
9. Uninstaller

For more information visit The XLab FAQs and read the FAQ on removing software.

Happy have you used any of those "cleanup" apps?

I have been test them and I have found many problems with them. They many times fail to find everything or they go off deleting far too much.

You might want to edit that reply so that it includes safer apps.

Allan, yes I have. All such programs are unable to remove everything, but they remove nearly as close as you can get or do the job properly in most cases. I've never seen these delete "too much."

I use AppDelete which catches everything I might catch with Easy Find and a thorough search. I'm comfortable with them. However, I have not yet verified if they all work with Sierra.

After what I saw during my testing of them, I have opted to not use any of them.