What to do with disk drive icon on desktop after App install?

[Iphone4sinwhite]

I recently downloaded an App called detune to my cMBP. My Mac is running 10.8.2 and the app is not from the App store. The app download placed a disk drive icon on the desktop which I clicked on and dragged the application to the application folder. I have since used the app and it works great. Can I drag the disc drive icon for the Detune app into the trash can? I have installed other apps, some of which not from the App store, that have not placed the disk drive icon on the desktop.
I'm sure this is a very elementary question, this is the first Mac I have owned since having a II gs in the 80s.

 

[simsaladimbamba]

Yes, ejecting that Disk Image via dragging it to the Trash or rightclicking it and selecting EJECT or selecting it and pressing CMD+E will work.

Installing Applications in Mac OS X

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