The Guide shows you Visually How to Create a New Application Launcher inside to the Main Menu on Snow-Linux 4 Glacier Mate Desktop.
The Practical Example Here Illustrated is About Adding the Firefox Nightly Entry inside to the Internet Section a Snow Linux Mate.
The Technique is Useful for Adding Any New Software on a Snow-Linux 4 Mate Desktop.
On the Bost Bottom Bonus Link for Installing Evernote and Google-Chrome for Snow-Linux 4 Glacier Mate Desktop.

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Right Click on Main Menu >> Edit Menu
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On Main Menu
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Select the Applications Group for the New Laucher
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Select New Item
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On the Create Launcher Select the Icon
Here Below Link to Article with Tutorial 4 Locating Files/Icons Under Linux.
Linux How to Locate Command