Highlight the icon you want to put in the folder - hit the BB button I select move - move the icon over the folder - click to end the move and place the icon in the folder...
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What else were you looking to put in them?? All the apps email etc and other icons can be put into folders... What else? Documents and things are held in folders on your device memory/SD card and accessed by the aforementioned apps etc... Sorry if I'm not getting exactly what you mean. :-)
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