Most most programs can be uninstalled by dragging and dropping it into the trash can. However, other programs will include an uninstaller app that will do it all for you.
Think of the whole interface the same as Windows (you did use Windows, right?). You can drag and drop icons wherever you want. Whether it's in a folder or on the desktop. There also sometimes are aliases (a.k.a. shortcuts, in Windows terms) that are created on your desktop. These can be trashed without a problem. Programs can be deleted in the same fashion, if you desire. It won't damage your system, but if it was a program you needed, you'll have to install or download it again.
PS: I don't want to sound like a jerk, but could you fix up your grammar a little? I'm having trouble reading your messages, but I do want to help, so I have to re-read them to understand them. Thanks.