Applying png icons

How do i apply png icons using candybar ? Or do i have to convert them to icns first ? And what program do i ned to convert png to icn ?

Thx

#449610

http://www.versiontracker.com/dyn/moreinfo/macosx/13226

#449635

or this http://iconfactory.com/software/pixadex

#449645

/thx very much

#449648